infra: actions: set build job to only build

.gitea/workflows/gentoo-utils.yml

@@ -73,4 +73,6 @@ jobs:
         uses: actions/checkout@v5
 
       - name: build and check
-        run: ./check.sh
+        run: |
+          meson setup -Dfuzz=enabled -Dtests=enabled -Dbuildtype=debugoptimized -Ddocs=enabled build
+          meson compile -C build