Added: CI workflow to build & push Docker image on release

.github/workflows/build-and-push-dockerhub.yml

@@ -0,0 +1,36 @@
+name: Build and Push Docker Image to Docker Hub
+
+on:
+  release:
+    types: [published]
+
+env:
+  DOCKER_REPO: ${{ secrets.DOCKER_HUB_USERNAME }}/walauncher
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_PASSWORD }}
+
+      - name: Extract release version
+        id: extract_version
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+
+      - name: Build Docker image
+        run: |
+          docker build -t ${{ env.DOCKER_REPO }}:${{ env.RELEASE_VERSION }} .
+          docker tag ${{ env.DOCKER_REPO }}:${{ env.RELEASE_VERSION }} ${{ env.DOCKER_REPO }}:latest
+
+      - name: Push Docker image
+        run: |
+          docker push ${{ env.DOCKER_REPO }}:${{ env.RELEASE_VERSION }}
+          docker push ${{ env.DOCKER_REPO }}:latest