Publishing a docker image according git tags

build.sh

#!/usr/bin/env bash

# docker hub username
USERNAME=marcosricardoss
# image name
IMAGE=helloworld
docker build -t $USERNAME/$IMAGE:latest .

# make it executable with chmod a+x ./build.sh

release.sh

#!/usr/bin/env bash

# docker login
docker login
# docker hub username
USERNAME=marcosricardoss
# image names
IMAGE=helloworld
# getting the last git tag
version=`git tag --sort=taggerdate | grep "" | tail -1`
# creating a tag of the latest current image with the last git tag found
docker tag $USERNAME/$IMAGE:latest $USERNAME/$IMAGE:$version
# push
docker push $USERNAME/$IMAGE:latest
docker push $USERNAME/$IMAGE:$version

# make it executable with chmod a+x ./release.sh