Basic Github Workflow for testing charts

docker-compose.yaml

# reference : https://medium.com/codex/setup-multiple-node-groups-for-local-k3s-clusters-with-docker-compose-d9f1a49c1774
# reference : https://gist.github.com/rockcyj/86c54d866ab5a1b38e6aaf4315d3149a#file-k3s-nodegroup-taint-yaml

version: '3'
services:
  server:
    image: "rancher/k3s:${K3S_VERSION:-latest}"
    command: 
    - server
    tmpfs:
    - /run
    - /var/run
    privileged: true
    environment:
    - K3S_TOKEN=secret
    - K3S_KUBECONFIG_OUTPUT=/output/kubeconfig.yaml
    - K3S_KUBECONFIG_MODE=666
    volumes:
    - .:/output
    ports:
    - 6443:6443

  agent:
    image: "rancher/k3s:${K3S_VERSION:-latest}"
    command:
    - agent
    tmpfs:
    - /run
    - /var/run
    privileged: true
    environment:
    - K3S_URL=https://server:6443
    - K3S_TOKEN=secret

k3s-test.yaml

name: k3s Testing
on: push
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3
      - name: Testing Chart
        run: |
          docker-compose up -d --scale agent=3
          # wait until k3s up
          until [ -f kubeconfig.yaml ]
          do
            sleep 5
          done
          # copy KUBECONFIG
          mkdir -p .kube
          cp -f kubeconfig.yaml .kube/config
          chmod 600 .kube/config
          export KUBECONFIG=$PWD/.kube/config
          # install helm
          curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
          chmod 700 get_helm.sh
          ./get_helm.sh

          # install goss
          export GOSS_VER=v0.3.16
          curl -fsSL https://goss.rocks/install | GOSS_DST=/usr/local/bin sh

          curl -L https://raw.githubusercontent.com/aelsabbahy/goss/master/extras/dgoss/dgoss -o /usr/local/bin/dgoss
          chmod +rx /usr/local/bin/dgoss

          curl -L https://raw.githubusercontent.com/aelsabbahy/goss/master/extras/kgoss/kgoss -o /usr/local/bin/kgoss
          chmod +rx /usr/local/bin/kgoss

          # test k3s and goss binaries
          kubectl get nodes
          goss | true
          kgoss | true
          dgoss | true

          # install test charts
          helm repo add bitnami https://charts.bitnami.com/bitnami
          helm install test bitnami/nginx --wait
          
          # install test service
          cat <<EOF > svc.yaml
          apiVersion: v1
          kind: Service
          metadata:
            name: nginx
          spec:
            type: ExternalName
            externalName: test-nginx
          EOF
          kubectl apply -f svc.yaml

          # check status
          kubectl get pods -A
          kubectl get svc -A

      - name: Cleanup k3s
        if: always()
        run: |
          docker-compose down -v | true