name: Publish Docker Image

on:
  push:
    tags:
      - '*.*.*'
      - '!*.*.*-*'

jobs:
  docker-publish:
    runs-on: ubuntu-latest
    steps:
      # https://stackoverflow.com/questions/58177786
      - name: Get version
        run: echo "GIT_TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV

      - 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 DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build and push to Docker Hub
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: |
            n1try/wakapi:${{ env.GIT_TAG }}
            n1try/wakapi:latest
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache