add build workflow

.github/workflows/build.yaml

@@ -0,0 +1,36 @@
+name: Build Image
+
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+\-rc[0-9]+'
+      - '[0-9]+.[0-9]+.[0-9]+\-b[0-9]+'
+      - '[0-9]+.[0-9]+.[0-9]+'
+      - '[0-9]+.[0-9]+\-rc[0-9]+'
+      - '[0-9]+.[0-9]+\-b[0-9]+'
+      - '[0-9]+.[0-9]+'
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref }}  # checkout current branch
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build ${{ github.ref_name }} Prod Image
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: papermerge/west:${{ github.ref_name }}
+          file: docker/Dockerfile
+          platforms: linux/amd64