Update flatpak-builder/index.js

Co-authored-by: bbhtt <[email protected]>

Author: alatiera

flatpak-builder/index.js

@@ -217,7 +217,7 @@ const build = async (manifest, manifestPath, cacheHitKey, config) => {
   if (config.cacheBuildDir) { cacheKey = await config.cacheKey() }
 
   core.info('Building the flatpak...')
-  const subject = `'Built from ${process.env.GITHUB_SHA || 'unknown'}'`
+  const subject = `Built from ${process.env.GITHUB_SHA || 'unknown'}`
 
   const args = [
     `--repo=${config.localRepoName}`,