Push docker image gha (#134)

* Push docker image gha

* Fix

* Build multi platform iimage

* Push only on master branch

.github/workflows/push-image.yml

@@ -0,0 +1,30 @@
+name: Push Docker image
+
+on:
+  push:
+    branches: 
+      - master
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      -
+        name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ vars.DOCKERHUB_USERNAME }}/messagen:latest