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name: Build Base Docker Image

on:
  push: 
    branches:
      - main
    paths:
      - 'environment.yml'

jobs: 
  build:
    name: Build base Docker image 
    runs-on: ubuntu-latest
    environment: numpy-dev
    if: "github.repository_owner == 'numpy' && !contains(github.event.head_commit.message, '[ci skip]') && !contains(github.event.head_commit.message, '[skip ci]') && !contains(github.event.head_commit.message, '[skip github]')"
    steps:
      - name: Clone repository
        uses: actions/checkout@v2
      - name: Lint Docker 
        uses: brpaz/hadolint-action@v1.2.1
        with: 
          dockerfile: ./tools/gitpod/Dockerfile
      - name: Get refs
        shell: bash
        run: |
          export raw_branch=${GITHUB_REF#refs/heads/}
          echo "::set-output name=branch::${raw_branch//\//-}"
          echo "::set-output name=date::$(date +'%Y%m%d')"
          echo "::set-output name=sha8::$(echo ${GITHUB_SHA} | cut -c1-8)"
        id: getrefs
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      - name: Cache Docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: ${{ runner.os }}-buildx-
      - name: Login to Docker Hub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          context: "."
          file: "./tools/gitpod/Dockerfile"
          push: ${{ github.event_name != 'pull_request' }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache
          tags: |
            numpy/numpy-dev:${{ steps.getrefs.outputs.date }}-${{ steps.getrefs.outputs.branch}}-${{ steps.getrefs.outputs.sha8 }}, numpy/numpy-dev:latest
      - name: Image digest 
        # Return details of the image build: sha and shell
        run: echo ${{ steps.docker_build.outputs.digest }}