fix: Make downloaded binary executable.

Current gitea releases do not ship with the binary in the archive
executable. This results in the service failing to start after updating.
This commit ensures the binary is always executable.

gitea_auto_update/lib/download.py

@@ -67,6 +67,8 @@ class Download:
         #  moving temp file to gtfile location
         cmd = 'mv ' + self.tmpDir + 'gitea-' + self.githubVersion + '-' + self.gtSystem + ' ' + self.gtFile
         os.system(cmd)
+        cmd = 'chmod +x ' + self.gtFile
+        os.system(cmd)
 
     def checkAndExtract(self):
         os.chdir(self.tmpDir)