add cosa and rhcos commit

I am trying to tackle this issue https://issues.redhat.com/browse/GRPA-2086
This is my commit in cosa https://github.com/bh7cw/coreos-assembler/commit/1cf18ba390af2083b16516b9a6da9ac9d446041e
Then, I tested the code:
1) create a trigger on quay.io to build image after Git repo is pushed https://quay.io/repository/bh7cw/coreos-assembler?tab=builds
2) Run the cosa on local machine:
    cosa file:
        #!/usr/bin/env bash

        # this script will use podman, but docker will work too
        rpm -qa | grep -q podman || (echo "podman not installed!" ; exit 1)

        # checks if cosa image was pulled previously
        podman image exists quay.io/bh7cw/coreos-assembler || \
          podman pull quay.io/bh7cw/coreos-assembler

        # create a tmp directory for storing builds
        mkdir -p rhcos && cd rhcos

        # define the _real_ cosa command
        cosa() {
           env | grep COREOS_ASSEMBLER
           set -x
           podman run --rm -ti --security-opt label=disable --privileged                                    \
                      --uidmap=1000:0:1 --uidmap=0:1:1000 --uidmap 1001:1001:64536                          \
                      -v ${PWD}:/srv/ --device /dev/kvm --device /dev/fuse                                  \
                      --tmpfs /tmp -v /var/tmp:/var/tmp --name cosa                                         \
                      ${COREOS_ASSEMBLER_CONFIG_GIT:+-v $COREOS_ASSEMBLER_CONFIG_GIT:/srv/src/config/:ro}   \
                      ${COREOS_ASSEMBLER_GIT:+-v $COREOS_ASSEMBLER_GIT/src/:/usr/lib/coreos-assembler/:ro}  \
                      ${COREOS_ASSEMBLER_CONTAINER_RUNTIME_ARGS}                                            \
                      ${COREOS_ASSEMBLER_CONTAINER:-quay.io/bh7cw/coreos-assembler:latest} "$@"
           rc=$?; set +x; return $rc
        }

        # run the cosa container and run shell
        cosa shell
    
    # execute commands:
    chmod +x cosa
    ./cosa
    # build the rhcos:
    sudo curl -kL -o /etc/pki/ca-trust/source/anchors/Red_Hat_IT_Root_CA.crt https://password.corp.redhat.com/RH-IT-Root-CA.crt
    sudo update-ca-trust

    # fetch the Red Hat CoreOS configuration
    cosa init https://gitlab.cee.redhat.com/coreos/redhat-coreos.git
    cosa fetch
    cosa build
    
3)upload oscontainer and inspect:
    cosa upload-oscontainer --name oci:/tmp/testing --from registry.access.redhat.com/ubi8/ubi:latest
    skopeo inspect oci:/tmp/testing
    
Expected result:
show "com.coreos.coreos-assembler-commit" and "com.coreos.redhat-coreos-commit" Labels.

Got result:
[coreos-assembler]$ cosa upload-oscontainer --name oci:/tmp/testing --from registry.access.redhat.com/ubi8/ubi:latest
Preparing to upload oscontainer for build: 46.82.202006262035-0
+ /usr/bin/ostree checkout --repo /srv/tmp/repo --user-mode --subpath=/usr/lib/os-release 54819e60a948c6aa2952ac1eaa54fed7df441afa0fa44af2c5023df5a4ae4cc6 tmp/usrlib-osrelease
Using nested container mode due to container environment variable
Getting image source signatures
Copying blob 264aaa453271 done  
Copying blob 7f24bdb73d53 done  
Copying config a523835cfc done  
Writing manifest to image destination
Storing signatures
Copying ostree commit into container: 54819e60a948c6aa2952ac1eaa54fed7df441afa0fa44af2c5023df5a4ae4cc6 ...
+ ostree --repo=/srv/tmp/containers-storage/vfs/dir/27657ba7b9c1261c620f56c34c5ee1d651fcf44ece8e99bff4250d74a4ad3612/srv/repo pull-local /srv/tmp/repo 54819e60a948c6aa2952ac1eaa54fed7df441afa0fa44af2c5023df5a4ae4cc6
7680 metadata, 30974 content objects imported                                                                                                                      
1cf18ba390af2083b16516b9a6da9ac9d446041e
2f28461010ad4f0f2420108dab219f4c58907ecb
+ buildah --root=./tmp/containers-storage --storage-driver vfs config --entrypoint [\"/noentry\"] -l com.coreos.ostree-commit=54819e60a948c6aa2952ac1eaa54fed7df441afa0fa44af2c5023df5a4ae4cc6 -l version=46.82.202006262035-0 -l com.coreos.coreos-assembler-commit=1cf18ba390af2083b16516b9a6da9ac9d446041e -l com.coreos.redhat-coreos-commit=2f28461010ad4f0f2420108dab219f4c58907ecb -l "io.openshift.build.version-display-names=machine-os=Red Hat Enterprise Linux CoreOS" -l io.openshift.build.versions=machine-os=46.82.202006262035-0 ubi-working-container
Committing container...
Getting image source signatures
Copying blob f9327c1608ad done  
Copying blob 449675ca11bc done  
Copying blob f7da2ed23cb9 [======================================] 800.3MiB / 800.3MiB
Copying config eff1667a25 done  
Writing manifest to image destination
Storing signatures
oci:/tmp/testing:46.82.202006262035-0 
Pushing container
+ podman --root=./tmp/containers-storage --storage-driver vfs push --tls-verify oci:/tmp/testing:46.82.202006262035-0 --digestfile=tmp/oscontainer-digest
Error: invalid reference format
Traceback (most recent call last):
  File "/usr/lib/coreos-assembler/oscontainer.py", line 326, in <module>
    main()
  File "/usr/lib/coreos-assembler/oscontainer.py", line 310, in main
    oscontainer_build(
  File "/usr/lib/coreos-assembler/oscontainer.py", line 244, in oscontainer_build
    run_verbose(podCmd)
  File "/usr/lib/coreos-assembler/oscontainer.py", line 67, in run_verbose
    subprocess.check_call(args, **kwargs)
  File "/usr/lib64/python3.8/subprocess.py", line 364, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['podman', '--root=./tmp/containers-storage', '--storage-driver', 'vfs', 'push', '--tls-verify', 'oci:/tmp/testing:46.82.202006262035-0', '--digestfile=tmp/oscontainer-digest']' returned non-zero exit status 125.
Traceback (most recent call last):
  File "/usr/lib/coreos-assembler/cmd-upload-oscontainer", line 88, in <module>
    subprocess.check_call(cosa_argv +
  File "/usr/lib64/python3.8/subprocess.py", line 364, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['sudo', '--preserve-env=container,REGISTRY_AUTH_FILE', '/usr/lib/coreos-assembler/oscontainer.py', '--workdir=./tmp', 'build', '--from=registry.access.redhat.com/ubi8/ubi:latest', '--display-name=Red Hat Enterprise Linux CoreOS', '--digestfile=tmp/oscontainer-digest', '--push', '/srv/tmp/repo', '54819e60a948c6aa2952ac1eaa54fed7df441afa0fa44af2c5023df5a4ae4cc6', 'oci:/tmp/testing:46.82.202006262035-0']' returned non-zero exit status 1.
[coreos-assembler]$ skopeo inspect oci:/tmp/testing
{
    "Digest": "sha256:3bf27d318a413ab3b620e6238098d2af23b4f55cedc16d6ba8a25d81d118ed26",
    "RepoTags": [],
    "Created": "2020-06-26T20:42:11.593068864Z",
    "DockerVersion": "",
    "Labels": {
        "architecture": "x86_64",
        "build-date": "2020-06-22T07:30:14.481393",
        "com.coreos.coreos-assembler-commit": "1cf18ba390af2083b16516b9a6da9ac9d446041e",
        "com.coreos.ostree-commit": "54819e60a948c6aa2952ac1eaa54fed7df441afa0fa44af2c5023df5a4ae4cc6",
        "com.coreos.redhat-coreos-commit": "2f28461010ad4f0f2420108dab219f4c58907ecb",
        "com.redhat.build-host": "cpt-1003.osbs.prod.upshift.rdu2.redhat.com",
        "com.redhat.component": "ubi8-container",
        "com.redhat.license_terms": "https://www.redhat.com/en/about/red-hat-end-user-license-agreements#UBI",
        "description": "The Universal Base Image is designed and engineered to be the base layer for all of your containerized applications, middleware and utilities. This base image is freely redistributable, but Red Hat only supports Red Hat technologies through subscriptions for Red Hat products. This image is maintained by Red Hat and updated regularly.",
        "distribution-scope": "public",
        "io.buildah.version": "1.14.9",
        "io.k8s.description": "The Universal Base Image is designed and engineered to be the base layer for all of your containerized applications, middleware and utilities. This base image is freely redistributable, but Red Hat only supports Red Hat technologies through subscriptions for Red Hat products. This image is maintained by Red Hat and updated regularly.",
        "io.k8s.display-name": "Red Hat Universal Base Image 8",
        "io.openshift.build.version-display-names": "machine-os=Red Hat Enterprise Linux CoreOS",
        "io.openshift.build.versions": "machine-os=46.82.202006262035-0",
        "io.openshift.expose-services": "",
        "io.openshift.tags": "base rhel8",
        "maintainer": "Red Hat, Inc.",
        "name": "ubi8",
        "release": "299.1592810498",
        "summary": "Provides the latest release of Red Hat Universal Base Image 8.",
        "url": "https://access.redhat.com/containers/#/registry.access.redhat.com/ubi8/images/8.2-299.1592810498",
        "vcs-ref": "2f70d2e5b96ea67813c0f06b74a23775a118e7db",
        "vcs-type": "git",
        "vendor": "Red Hat, Inc.",
        "version": "46.82.202006262035-0"
    },
    "Architecture": "amd64",
    "Os": "linux",
    "Layers": [
        "sha256:f9327c1608ad0ae79b5f4a4c47eda907a980ea9640c70e6036811ea76d641249",
        "sha256:449675ca11bc217d5066dcce0a7dcb774bc87cb2553a8f137bc875cb5dddf4d4",
        "sha256:f7da2ed23cb9ebbbfce98c6b394f550f1597295bdff4caf58c0e4dd4a3cd9523"
    ],
    "Env": [
        "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
        "container=oci"
    ]
}