Track branch state when parsing versions

bin/app-json.py

@@ -151,6 +151,8 @@ def get_app_versions(app_path):
         log.info(f"No tags discovered, moving on")
         return {}
 
+    initial_branch = _run_cmd("git rev-parse --abbrev-ref HEAD")
+
     for tag in tags:
         _run_cmd(f"git checkout {tag}")
 
@@ -186,7 +188,7 @@ def get_app_versions(app_path):
 
         versions[tag] = service_versions
 
-    _run_cmd("git checkout HEAD")
+    _run_cmd(f"git checkout {initial_branch}")
 
     return versions