Add GitHub Actions workflow for Docker Hub build

Author: gwillis-inovacon

.github/workflows/build-web-dockerhub.yml

@@ -0,0 +1,28 @@
+name: Build AppFlowy Web Docker Hub
+
+  on:
+    workflow_dispatch:
+
+  jobs:
+    build-appflowy-web:
+      runs-on: ubuntu-latest
+      steps:
+        - name: Checkout
+          uses: actions/checkout@v4
+
+        - name: Set up Docker Buildx
+          uses: docker/setup-buildx-action@v3
+
+        - name: Login to Docker Hub
+          uses: docker/login-action@v3
+          with:
+            username: ${{ secrets.DOCKERHUB_USERNAME }}
+            password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+        - name: Build and push appflowy_web
+          uses: docker/build-push-action@v5
+          with:
+            context: .
+            file: ./docker/Dockerfile
+            push: true
+            tags: gwillisyodev/appflowy_web:latest