ci(release): limit goreleaser parallelism to avoid OOM on runner

A single clean cross-build peaks at ~7GB RSS (internal/extensions yaegi
symbol table). goreleaser builds targets in parallel by default, which
exhausts the 7GB ubuntu-latest runner and OOM-kills the build with no
error output. Force --parallelism 1 and cap go compiler with GOFLAGS=-p=2.

.github/workflows/release.yml

@@ -35,9 +35,10 @@ jobs:
         with:
           distribution: goreleaser
           version: "~> v2"
-          args: release --clean
+          args: release --clean --parallelism 1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GOFLAGS: -p=2
 
   npm-publish:
     runs-on: ubuntu-latest