Upload Docker images for releases to both Docker Hub and GitHub Container Registry (#2299)

* Upload Docker images for releases to both Docker Hub and GitHub Container Registry

* Build current images on `:main` tag

* Use Dendrite flow to trigger Docker flow for `:main`

* Tweaks

* Fix references to `env.GHCR_NAMESPACE`

2 files changed, 136 insertions, 71 deletions

diff --git a/.github/workflows/docker-hub.yml b/.github/workflows/docker-hub.yml
deleted file mode 100644
index 0322866d..00000000
--- a/.github/workflows/docker-hub.yml
+++ /dev/null
@@ -1,71 +0,0 @@
-# Based on https://github.com/docker/build-push-action
-
-name: "Docker Hub"
-
-on:
-  release:
-    types: [published]
-
-env:
-  DOCKER_NAMESPACE: matrixdotorg
-  DOCKER_HUB_USER: dendritegithub
-  PLATFORMS: linux/amd64,linux/arm64,linux/arm/v7
-
-jobs:
-  Monolith:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Get release tag
-        run: echo "RELEASE_VERSION=${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 Docker Hub
-        uses: docker/login-action@v1 
-        with:
-          username: ${{ env.DOCKER_HUB_USER }}
-          password: ${{ secrets.DOCKER_TOKEN }}
-
-      - name: Build monolith image
-        id: docker_build_monolith
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          file: ./build/docker/Dockerfile.monolith
-          platforms: ${{ env.PLATFORMS }}
-          push: true
-          tags: |
-            ${{ env.DOCKER_NAMESPACE }}/dendrite-monolith:latest
-            ${{ env.DOCKER_NAMESPACE }}/dendrite-monolith:${{ env.RELEASE_VERSION }}
-
-  Polylith:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Get release tag
-        run: echo "RELEASE_VERSION=${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 Docker Hub
-        uses: docker/login-action@v1 
-        with:
-          username: ${{ env.DOCKER_HUB_USER }}
-          password: ${{ secrets.DOCKER_TOKEN }}
-
-      - name: Build polylith image
-        id: docker_build_polylith
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          file: ./build/docker/Dockerfile.polylith
-          platforms: ${{ env.PLATFORMS }}
-          push: true
-          tags: |
-            ${{ env.DOCKER_NAMESPACE }}/dendrite-polylith:latest
-            ${{ env.DOCKER_NAMESPACE }}/dendrite-polylith:${{ env.RELEASE_VERSION }}
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
new file mode 100644
index 00000000..129a9f0a
--- /dev/null
+++ b/.github/workflows/docker.yml
@@ -0,0 +1,136 @@
+# Based on https://github.com/docker/build-push-action
+
+name: "Docker Hub"
+
+on:
+  release: # A GitHub release was published
+    types: [published]
+  workflow_run: # The Dendrite pipeline completed successfully on main
+    workflows: [Dendrite]
+    types: [completed]
+    branches: [main]
+
+env:
+  DOCKER_NAMESPACE: matrixdotorg
+  DOCKER_HUB_USER: dendritegithub
+  GHCR_NAMESPACE: matrix-org
+  PLATFORMS: linux/amd64,linux/arm64,linux/arm/v7
+
+jobs:
+  monolith:
+    name: Monolith image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Get release tag
+        if: github.event_name == 'release' # Only for GitHub releases
+        run: echo "RELEASE_VERSION=${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 Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ env.DOCKER_HUB_USER }}
+          password: ${{ secrets.DOCKER_TOKEN }}
+      - name: Login to GitHub Containers
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build monolith image
+        if: >-
+          github.event_name == 'workflow_run' &&
+          github.event.workflow_run.conclusion == 'success'
+        id: docker_build_monolith
+        uses: docker/build-push-action@v2
+        with:
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          context: .
+          file: ./build/docker/Dockerfile.monolith
+          platforms: ${{ env.PLATFORMS }}
+          push: true
+          tags: |
+            ${{ env.DOCKER_NAMESPACE }}/dendrite-monolith:main
+            ghcr.io/${{ env.GHCR_NAMESPACE }}/dendrite-monolith:main
+
+      - name: Build release monolith image
+        if: github.event_name == 'release' # Only for GitHub releases
+        id: docker_build_monolith
+        uses: docker/build-push-action@v2
+        with:
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          context: .
+          file: ./build/docker/Dockerfile.monolith
+          platforms: ${{ env.PLATFORMS }}
+          push: true
+          tags: |
+            ${{ env.DOCKER_NAMESPACE }}/dendrite-monolith:latest
+            ${{ env.DOCKER_NAMESPACE }}/dendrite-monolith:${{ env.RELEASE_VERSION }}
+            ghcr.io/${{ env.GHCR_NAMESPACE }}/dendrite-monolith:latest
+            ghcr.io/${{ env.GHCR_NAMESPACE }}/dendrite-monolith:${{ env.RELEASE_VERSION }}
+
+  polylith:
+    name: Polylith image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Get release tag
+        if: github.event_name == 'release' # Only for GitHub releases
+        run: echo "RELEASE_VERSION=${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 Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ env.DOCKER_HUB_USER }}
+          password: ${{ secrets.DOCKER_TOKEN }}
+      - name: Login to GitHub Containers
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build polylith image
+        if: >-
+          github.event_name == 'workflow_run' &&
+          github.event.workflow_run.conclusion == 'success'
+        id: docker_build_polylith
+        uses: docker/build-push-action@v2
+        with:
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          context: .
+          file: ./build/docker/Dockerfile.polylith
+          platforms: ${{ env.PLATFORMS }}
+          push: true
+          tags: |
+            ${{ env.DOCKER_NAMESPACE }}/dendrite-polylith:main
+            ghcr.io/${{ env.GHCR_NAMESPACE }}/dendrite-polylith:main
+
+      - name: Build release polylith image
+        if: github.event_name == 'release' # Only for GitHub releases
+        id: docker_build_polylith
+        uses: docker/build-push-action@v2
+        with:
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          context: .
+          file: ./build/docker/Dockerfile.polylith
+          platforms: ${{ env.PLATFORMS }}
+          push: true
+          tags: |
+            ${{ env.DOCKER_NAMESPACE }}/dendrite-polylith:latest
+            ${{ env.DOCKER_NAMESPACE }}/dendrite-polylith:${{ env.RELEASE_VERSION }}
+            ghcr.io/${{ env.GHCR_NAMESPACE }}/dendrite-polylith:latest
+            ghcr.io/${{ env.GHCR_NAMESPACE }}/dendrite-polylith:${{ env.RELEASE_VERSION }}