remove pull-requests from release triggers, only trigger on tags. (#25)

Author: digitalsparky

.github/workflows/release.yaml

@@ -1,7 +1,6 @@
 name: goreleaser
 
 on:
-  pull_request:
   push:
     # run only against tags
     tags:
@@ -37,4 +36,4 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           # Your GoReleaser Pro key, if you are using the 'goreleaser-pro' distribution
-          # GORELEASER_KEY: ${{ secrets.GORELEASER_KEY }}
+          # GORELEASER_KEY: ${{ secrets.GORELEASER_KEY }}