add workflow

.forgejo/workflows/build.yaml

@@ -0,0 +1,17 @@
+name: Build Project
+
+on: [push]
+jobs:
+  build:
+    runs-on: docker
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout the repo
+        uses: actions/checkout@v4
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Build
+        uses: docker/build-push-action@v6
+        with:
+          push: false
+