Use the version instead of the branch to determine pre-release status

This will allow to manually create pre-release tags in case adamralph/minver#489 is not merged.

Author: 0xced

.github/workflows/continuous-integration.yml

@@ -55,4 +55,4 @@ jobs:
           release_name: Version ${{ needs.package.outputs.version }}
           body: ${{ github.event.head_commit.message }}
           draft: false
-          prerelease: ${{ github.ref }} == 'refs/heads/prerelease'
+          prerelease: ${{ contains(needs.package.outputs.version, '-') }}