Add back Docker canary workflow

Author: mariusbegby

.github/workflows/docker_canary.yml

@@ -0,0 +1,30 @@
+name: Build and Push Docker Image on commit to main
+
+env:
+    RELEASE_VERSION:
+
+on:
+    push:
+        branches:
+            - main
+
+jobs:
+    release:
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout code
+              uses: actions/checkout@v4
+
+            - name: Login to DockerHub
+              uses: docker/login-action@v3
+              with:
+                  username: ${{ secrets.DOCKER_USERNAME }}
+                  password: ${{ secrets.DOCKER_PASSWORD }}
+
+            - name: Build and Push Docker Image
+              uses: docker/build-push-action@v5
+              with:
+                  context: .
+                  push: true
+                  tags: mariusbegby/cadence:canary