Reduce Test step to only one arch (amd64/buster)

Migrate build and push step to native github actions using docker buildX - which should _hopefully_ resolve #735
Make some adjustments to Dockerfile/build.yml/install.sh to allow both gh-actions-test.sh to build using the test suite, and github actions native commands to build online

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

.github/workflows/test-and-build.yaml

@@ -7,20 +7,12 @@ on:
   release:
     types: [published]
 
-#env:
-#  DOCKER_HUB_REPO: pihole
-
 jobs:
-  test-and-build:
+  test:
     runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        ARCH: [amd64, armhf, arm64, i386]
-        DEBIAN_VERSION: [buster]
     env:
-      ARCH: ${{matrix.ARCH}}
-      DEBIAN_VERSION: ${{matrix.DEBIAN_VERSION}}
+      ARCH: amd64
+      DEBIAN_VERSION: buster
     steps:
       - name: Checkout Repo
         uses: actions/checkout@v2
@@ -28,34 +20,40 @@ jobs:
         run: |
           echo "Building ${ARCH}-${DEBIAN_VERSION}"
           ./gh-actions-test.sh
-      - name: Push the ARCH image
-        if: github.event_name != 'pull_request'
-        run: |
-          . gh-actions-vars.sh
-          echo "${{ secrets.DOCKERHUB_PASS }}" | docker login --username="${{ secrets.DOCKERHUB_USER }}" --password-stdin
-          docker push "${ARCH_IMAGE}"
-      - name: Upload gh-workspace
-        if: github.event_name != 'pull_request'
-        uses: actions/upload-artifact@v1
-        with:
-          name: gh-workspace
-          path: .gh-workspace
 
-  publish:
+  build-and-publish:
     if: github.event_name != 'pull_request'
+    needs: test
     runs-on: ubuntu-latest
-    needs: test-and-build
     steps:
-      - name: Checkout Repo
+      -
+        name: Checkout
         uses: actions/checkout@v2
-      - name: Download workspace files
-        uses: actions/download-artifact@v1
-        with:
-          name: gh-workspace
-          path: .gh-workspace
-      - name: Tag and Publish multi-arch images
-        env:
-          DOCKERHUB_PASS: ${{ secrets.DOCKERHUB_PASS }}
-          DOCKERHUB_USER: ${{ secrets.DOCKERHUB_USER }}
+      -
+        name: Get the tag name
         run: |
-          ./gh-actions-deploy.sh
+          echo "TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USER }}
+          password: ${{ secrets.DOCKERHUB_PASS }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/i386,linux/arm/v7
+          build-args: |
+            PIHOLE_TAG=${{ env.TAG }}
+            PIHOLE_VERSION=${{ env.TAG }}
+          push: true
+          tags: |
+            ${{ secrets.DOCKERHUB_USER }}/pihole:${{ env.TAG }}