docker-publish.yml

# Build Docker image of Iamus metaverse-server and publish in
#     Github Container Registry as "vircadia/Iamus".

name: Iamus Docker image

on:
  # Create Docker image on push to 'master'
  push:
    branches:
      - master

env:
  # Names used to tag built Docker image
  IMAGE_NAME: iamus
  # The local Docker image is named env.IMAGE_TAG so it can be referenced and pushed
  IMAGE_TAG: iamus:latest

jobs:
  push:
    runs-on: ubuntu-latest

    steps:
      # Checkout the repository into current runner context
      - name: checkout
        uses: actions/checkout@v2

      # Setup buildx environment (used if building for multiple platforms)
      - name: Setup QEMU
        uses: docker/setup-qemu-action@v1
        
      # Build Iamus
      - name: Build
        uses: docker/build-push-action@v2
        with:
          context: ./docker
          platforms: linux/amd64
          # platforms: linux/amd64,linux/arm64
          tags: ${{ env.IMAGE_TAG }}

      # Get version information from built image.
      # The unique version tag is generated during the build. Extract version string for image tagging.
      - name: Fetch version information
        run: |
          IVERSION=$(docker run --rm --entrypoint "./GetVersion.sh" ${{ env.IMAGE_TAG }})
          echo "IVERSION=$IVERSION"
          echo "IVERSION=$IVERSION" >> $GITHUB_ENV

      # Login to Github Container Registry with this registry's tokens
      - name: Login to Github Container registry
        uses: docker/#-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
        
      # Push to Github Container Registry
      - name: Push to Github Container Registry
        run: |
          docker image tag ${{ env.IMAGE_TAG }} ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:latest
          docker image tag ${{ env.IMAGE_TAG }} ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}:${{ env.IVERSION }}
          docker image push --all-tags ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}

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