chore: add docker canary publish action

.github/workflows/docker-publish-canary.yml

@@ -0,0 +1,40 @@
+# Reference: https://github.com/docker/build-push-action/blob/master/docs/advanced/tags-labels.md
+
+name: "Docker Publish Canary"
+
+on:
+  workflow_dispatch:
+
+jobs:
+  dockerize:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: moonrailgun/tailchat
+          # generate Docker tags based on the following events/attributes
+          tags: |
+            type=sha
+      - 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
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: VERSION=canary-${{ steps.meta.outputs.tags }}