Add Forgejo Actions workflow to build and test on push

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.forgejo/workflows/build.yml

@@ -0,0 +1,18 @@
+name: Build and Test
+on: [push]
+jobs:
+  build-and-test:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        run: |
+          git clone --branch ${{ github.ref_name }} ${{ github.server_url }}/${{ github.repository }}.git .
+      - name: Test
+        run: docker run --rm -w /src -v $PWD:/src golang:1.26 go test ./...
+      - name: Build
+        run: docker run --rm -w /src -v $PWD:/src -e CGO_ENABLED=0 golang:1.26 go build -ldflags "-s -w" -o hsa ./cmd/hsa
+      - name: Upload binary
+        uses: actions/upload-artifact@v3
+        with:
+          name: hsa
+          path: hsa