CI: Fix release target.

Author: agraef

.github/workflows/makefile.yml

@@ -137,7 +137,7 @@ jobs:
         retention-days: 2
 
   release:
-    if: startsWith(github.ref, 'refs/tags/')
+    if: github.ref_type == 'tag'
     runs-on: ubuntu-latest
     needs: [macos-build, ubuntu-build, windows-build]
     steps: