Update build-library.yml

Author: adrianhall

.github/workflows/build-library.yml

@@ -151,7 +151,7 @@ jobs:
 
   sign:
     needs: [build]
-    if: ${{ github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/heads/rel') }}
+    if: ${{ github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/') }}
     runs-on: windows-latest
     permissions:
       id-token: write
@@ -218,7 +218,7 @@ jobs:
           --skip-duplicate
 
   release:
-    if: ${{ startsWith(github.ref, 'refs/heads/rel/') }}
+    if: ${{ startsWith(github.ref, 'refs/tags/') }}
     needs: [ sign ]
     environment: nuget-release-gate
     runs-on: ubuntu-latest