Add a workflow to build v6-pre-alpha container nightly/on push to that branch

.github/workflows/v6-pre-alpha.yml

@@ -0,0 +1,65 @@
+name: Build & Publish
+on:
+  schedule:
+    - cron: '0 5 * * *'
+  push:
+    branches:
+      - v6-pre-alpha
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        if: github.event_name != 'schedule'
+        uses: actions/checkout@v3
+      -
+        name: Checkout dev branch if we are building
+        if: github.event_name == 'schedule'
+        uses: actions/checkout@v3
+        with:
+          ref: v6-pre-alpha
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          images: |
+            ${{ secrets.DOCKERHUB_NAMESPACE }}/pihole
+            ghcr.io/${{ github.repository_owner }}/pihole
+          flavor: |
+            latest=false
+          tags: |
+            v6-pre-alpha
+      -
+        name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USER }}
+          password: ${{ secrets.DOCKERHUB_PASS }}
+      -
+        name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: ./src/
+          platforms: linux/amd64, linux/arm64, linux/386, linux/arm/v7, linux/arm/v6
+          build-args: |
+            PIHOLE_DOCKER_TAG=${{ steps.meta.outputs.version }}
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}