ci: build and save artifact

.forgejo/workflows/release.yml

@@ -0,0 +1,16 @@
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.22
+      - run: go build .
+      - uses: actions/upload-artifact@v4
+        path: ./spud