Add build workflow

.forgejo/workflows/build.yml

@@ -0,0 +1,20 @@
+name: Build
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Run build script
+        run: ./build.sh
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: build-artifacts
+          path: ./build/*