Attemp to CICD for Docker push

.github/workflows/build.yml

@@ -38,6 +38,33 @@ jobs:
 
       - name: Build dRAGon
         run: gradle build -Pversion=$(gradle cV -q -Prelease.quiet)
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            dragon-okinawa/dragon
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: ./backend/
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
 
       - name: Push Release
         if: github.ref == 'refs/heads/main'