add docker hub deploy for branch.

.github/workflows/push-subscribers.yml

@@ -0,0 +1,35 @@
+name: Push Subscribers Container
+on:
+  push:
+    branches:
+      # - mls
+      - tsachi/topics-count-limit
+jobs:
+  deploy:
+    concurrency: main
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: xmtpeng
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Git Checkout
+        uses: actions/checkout@v3
+
+      - uses: actions/setup-go@v3
+        with:
+          go-version-file: go.mod
+
+      - name: Push
+        id: push
+        run: |
+          export DOCKER_IMAGE_TAG=subscribers-dev
+          IMAGE_TO_DEPLOY=xmtp/node-go@$(dev/docker/build)
+          echo Successfully pushed $IMAGE_TO_DEPLOY
+          echo "docker_image=${IMAGE_TO_DEPLOY}" >> $GITHUB_OUTPUT