ci: fail if tag is not on main

.github/workflows/release.yml

@@ -117,7 +117,10 @@ jobs:
         id: set-release
         run: |
           mainCount=$(git branch -r --contains ${{ github.ref }} --format "%(refname:lstrip=3)" | grep -xc main)
-          if [[ $GITHUB_REF =~ ^refs/tags/[0-9]+\.[0-9]+\.[0-9]+$ && $mainCount -gt 0 ]]; then
+          if [[ $mainCount -eq 0 ]]; then
+            echo "Tag was not pushed onto main branch, exiting"
+            exit 1
+          elif [[ $GITHUB_REF =~ ^refs/tags/[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
             echo "release=true" >> $GITHUB_OUTPUT
           else
             echo "release=false" >> $GITHUB_OUTPUT