Add Gitea Actions workflow

.github/workflows/build.yml

@@ -0,0 +1,31 @@
+name: Build and Push
+
+on:
+  push:
+    branches: [master]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: docker-runner
+    
+    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: refoseldev
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Build and Push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./games/source
+          push: true
+          tags: gitea.refoseltw.ru/rtw/games:source