ci(release): trigger on PR

Author: mrcjkb

.github/workflows/release.yml

@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - '*.*.*'
+  pull_request:
 
 jobs:
   luarocks-release:
@@ -20,8 +21,10 @@ jobs:
           dependencies: |
             LuaSnip
       - name: Fail if changelog entry does not exist
+        if: startsWith(github.ref, 'refs/tags/')
         run: grep -q "${{ github.ref_name }}" CHANGELOG.md
       - name: GitHub release
+        if: startsWith(github.ref, 'refs/tags/')
         uses: ncipollo/release-action@v1
         with:
           bodyFile: "CHANGELOG.md"