fix(release): correct output handling in release-on-tag workflow

Improved the way outputs are managed in the 'check_release' step by
returning values instead of direct assignments. This change ensures
better handling of release existence checks and improves code
readability. Added 'result-encoding' to specify string encoding for
results.

.github/workflows/release-on-tag.yml

@@ -21,14 +21,15 @@ jobs:
                 repo: context.repo.repo,
                 tag: context.ref.replace('refs/tags/', ''),
               })
-              outputs.release_exists = 'true'
+              return { release_exists: 'true' }
             } catch (error) {
               if (error.status === 404) {
-                outputs.release_exists = 'false'
+                return { release_exists: 'false' }
               } else {
                 throw error
               }
             }
+          result-encoding: string
 
       - name: Create Release
         if: steps.check_release.outputs.release_exists == 'false'
@@ -41,4 +42,4 @@ jobs:
           draft: false
           prerelease: false
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}