Reshuffle Dockerfile to optimise caching (#306)

* Refactor alpine folder

* Rearrange Dockerfile

* Updated build_push.yml for testing

* Updated build_push.yml for production

* Added IS_DOCKER env

* Added target to build_push.yml

.github/workflows/build_push.yml

@@ -1,36 +1,78 @@
-name: Docker images
+name: Publish Releases to Hub
 
+# When its time to do a release do a full cross platform build for all supported
+# architectures and push all of them to Docker Hub.
+# Only trigger on semver shaped tags.
+# Ref: https://github.com/metcalfc/docker-action-examples/blob/main/.github/workflows/release.yml
 on:
   push:
     tags-ignore:
       - "invoiceninja-*"
 
 jobs:
-  deploy:
-    name: Build images
+  docker:
     runs-on: ubuntu-latest
-
     steps:
-        - uses: actions/checkout@v1
+      - name: Checkout
+        uses: actions/checkout@v2
 
-        - name: Login to DockerHub
-          run: echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u ${{ secrets.DOCKERHUB_USERNAME }} --password-stdin
+      - name: Prepare
+        id: prep
+        run: |
+          DOCKER_IMAGE=invoiceninja/invoiceninja
+          VERSION=edge
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/}
+          fi
+          TAGS="${DOCKER_IMAGE}:${VERSION}"
+          MAJOR="$(echo "${VERSION}" | cut -d. -f1)"
+          MINOR="$(echo "${VERSION}" | cut -d. -f2)"
+          TAGS="$TAGS,${DOCKER_IMAGE}:${MAJOR},${DOCKER_IMAGE}:${MAJOR}.${MINOR}"
+          if [[ $VERSION =~ ^5\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+            TAGS="$TAGS,${DOCKER_IMAGE}:latest"
+          fi
+          echo ::set-output name=tags::${TAGS}
+          echo ::set-output name=version::${VERSION}
+          echo ::set-output name=major::${MAJOR}
 
-        - name: Get the latest tag
-          id: vars
-          run: echo ::set-output name=tag::$(echo ${GITHUB_REF:10})
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
 
-        - name: Build image from alpine - v5
-          run: make build-alpine-v5 TAG="${{steps.vars.outputs.tag}}"
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
 
-        - name: Push alpine-based image - v5
-          run: make push-alpine-v5 TAG="${{steps.vars.outputs.tag}}"
+      - 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: Build image from alpine - v4
-          run: make build-alpine TAG="${{steps.vars.outputs.tag}}"
+      - name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
 
-        - name: Push alpine-based image - v4
-          run: make push-alpine TAG="${{steps.vars.outputs.tag}}"
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          builder: ${{ steps.buildx.outputs.name }}
+          context: ./
+          file: ./alpine/${{ steps.prep.outputs.major }}/Dockerfile
+          build-args: INVOICENINJA_VERSION=${{ steps.prep.outputs.version }}
+          target: prod
+          platforms: linux/amd64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.prep.outputs.tags }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
 
-        - name: Logout from DockerHub
-          run: docker logout
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}