add package publishing gh action

.github/workflows/publish-ghcr.yaml

@@ -0,0 +1,33 @@
+name: hedgeapp backend
+
+on:
+  push:
+    branches: [master, develop]
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GH_PAT }}
+
+      - name: Set image tag
+        run: |
+          if [[ $GITHUB_REF == refs/heads/master ]]; then
+            IMAGE_TAG=latest
+          elif [[ $GITHUB_REF == refs/heads/develop ]]; then
+            IMAGE_TAG=develop
+          fi
+          echo "IMAGE_TAG=$IMAGE_TAG" >> $GITHUB_ENV
+
+      - name: Build and push docker image
+        run: |
+          docker build --tag ghcr.io/szarbartosz/hedgeapp-back:$IMAGE_TAG
+          docker push ghcr.io/szarbartosz/hedgeapp-back:$IMAGE_TAG