docker-nagios/.github/workflows/github-build.yml

name: Nagios Build
# This workflow is triggered on pushes to the repository.
# Taken from tutorial
# https://github.com/gitschooldude/hello
# https://www.youtube.com/watch?v=-xIXFxuZCMI
# https://github.com/marketplace/actions/docker-setup-buildx
# https://github.com/marketplace/actions/docker-login
# https://stackoverflow.com/questions/58033366/how-to-get-current-branch-within-github-actions/58034787

on: [push]

jobs:
  nagios-build:
    runs-on: ubuntu-latest
    steps:
      - name: Print all github.* variables
        id: step_one_print_all
        run: |
          echo "github.action : ${{ github.action }}"
          echo "github.action_path : ${{ github.action_path }}"
          echo "github.actor : ${{ github.actor }}"
          echo "github.base_ref : ${{ github.base_ref }}"
          echo 'github.event : ${{ toJson(github.event) }}'
          echo "github.event_name : ${{ github.event_name }}"
          echo "github.event_path : ${{ github.event_path }}"
          echo "github.head_ref : ${{ github.head_ref }}"
          echo "github.job : ${{ github.job }}"
          echo "github.ref : ${{ github.ref }}"
          echo "github.repository : ${{ github.repository }}"
          echo "github.repository_owner : ${{ github.repository_owner }}"
          echo "github.run_id : ${{ github.run_id }}"
          echo "github.run_number : ${{ github.run_number }}"
          echo "github.sha : ${{ github.sha }}"
          echo "github.token : ${{ github.token }}"
          echo "github.workflow : ${{ github.workflow }}"
          echo "github.workspace : ${{ github.workspace }}"
          echo "my docker tag: ${{ env.action_mytag }}"
      - name: Set the value of a the Docker tag for branches other than master
        id: step_two_branches_all
        if: ${{ (startsWith( github.ref, 'refs/heads') == true) && (github.ref != 'refs/heads/master') }}
        run: |
          echo "action_mytag=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
      - name: Set the value of the Docker tag for git tags
        id: step_set_docker_tag_for_git_tags
        if: ${{ startsWith( github.ref, 'refs/tags') == true}}
        run: |
          echo "action_mytag=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
      - name: Set the value of the Docker tag for master branch
        id: step_branch_master
        if: ${{ github.ref == 'refs/heads/master' }}
        run: |
          echo "action_mytag=latest" >> $GITHUB_ENV
      - name: Print the Docker tag value which will be used
        id: step_print_docker_tag
        run: |
          echo "My docker tag will be: ${{ env.action_mytag }}"
      - name: Login to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        name: Checkout
        uses: actions/checkout@v4
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v3
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
      -
        name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}
      -
        name: Cache Docker layers for this Git branch
        uses: actions/cache@v4
        id: cache
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.ref }}
          restore-keys: |
            ${{ runner.os }}-buildx-${{ github.ref }}
      - name: Docker Buildx (build and cache)
        run: |
          docker buildx build \
            --progress plain \
            --cache-from "type=local,src=/tmp/.buildx-cache" \
            --cache-to "type=local,dest=/tmp/.buildx-cache" \
            --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64 \
            --label "gitCommit=${{ github.sha }}" \
            --label "org.opencontainers.image.revision=${{ github.sha }}" \
            --tag ${GITHUB_ACTOR}/nagios:${{ env.action_mytag }} \
            --output "type=image,push=false" .
      - name: 'Docker Buildx: Push to Dockerhub'
        run: |
          echo "== This branch is : ${GITHUB_REF}"
          echo "Will push image ${GITHUB_ACTOR}/nagios:${{ env.action_mytag }} to DockerHub"
          docker buildx build \
            --progress plain \
            --cache-from "type=local,src=/tmp/.buildx-cache" \
            --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64 \
            --label "gitCommit=${{ github.sha }}" \
            --label "org.opencontainers.image.revision=${{ github.sha }}" \
            --tag ${GITHUB_ACTOR}/nagios:${{ env.action_mytag }} \
            --output "type=image,push=true" .
      - name: 'Docker Buildx: Push to GitHub Container Registry'
        run: |
          echo "== This branch is : ${GITHUB_REF}"
          echo "Will push image ghcr.io/${GITHUB_ACTOR}/nagios:${{ env.action_mytag }} to GitHub Container Registry"
          docker buildx build \
            --progress plain \
            --cache-from "type=local,src=/tmp/.buildx-cache" \
            --platform linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64 \
            --label "gitCommit=${{ github.sha }}" \
            --label "org.opencontainers.image.revision=${{ github.sha }}" \
            --tag ghcr.io/${GITHUB_ACTOR}/nagios:${{ env.action_mytag }} \
            --output "type=image,push=true" .
      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${GITHUB_ACTOR}/nagios:${{ env.action_mytag }}