Add GitHub Actions workflow for Gitea push

.github/workflows/push.yml

@@ -0,0 +1,32 @@
+name: Build and Push to Gitea
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - 'games/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.refoseltw.ru
+          username: ${{ secrets.GITEA_USERNAME }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Build and Push games:source
+        uses: docker/build-push-action@v5
+        with:
+          context: ./games/source
+          push: true
+          tags: gitea.refoseltw.ru/rtw/games:source