test-build-docker-image.yml

# This workflow tests building an OpenFAST docker image for the linux/amd64 architecture on push to a release candidate
# branch. The build cache is stored in GitHub actions.
name: test-build-docker-image

on:
  pull_request:
    branches:
      - main

jobs:
  test-build:
    if: startsWith(github.head_ref, 'rc-')
    runs-on: ubuntu-latest
    timeout-minutes: 300
    env:
      DOCKERFILE_PATH: share/docker/openfast_ubuntu/Dockerfile
      DOCKERHUB_REPOSITORY: octue/openfast
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Extract tag from release candidate branch name
        id: extract-tag
        run: echo "openfast-tag=$(expr substr "${{ github.head_ref }}" 4 100)" >> $GITHUB_OUTPUT

      - name: Test building docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ${{ env.DOCKERFILE_PATH }}
          platforms: linux/amd64
          tags: ${{ env.DOCKERHUB_REPOSITORY }}:${{ steps.extract-tag.outputs.openfast-tag }}
          push: false
          cache-from: type=gha
          cache-to: type=gha,mode=max