Add .gitea/workflows/build-docker.yml

.gitea/workflows/build-docker.yml

@@ -0,0 +1,23 @@
+name: Gitea Actions Demo
+run-name: Build Docker Container for Unciv Server
+on: [push]
+
+jobs:
+  Explore-Gitea-Actions:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Log in to registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.GITEA_DOMAIN }}
+          username: ${{ env.GITEA_REGISTRY_USER }}
+          password: ${{ secrets.CONTAINER_REGISTRY_TOKEN }}
+      - name: Build and push image
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ env.GITEA_DOMAIN }}/${{ env.RESULT_IMAGE_NAME }}:${{ gitea.ref }}