graph height fixed, local yearly data caching added

sources/manager_github.py

@@ -106,7 +106,7 @@ class GitHubManager:
             return False
 
     @staticmethod
-    def set_github_output(stats: str):
+    def set_github_output(stats: str) -> bool:
         """
         Outputs readme data as current action output instead of committing it.
 
@@ -114,13 +114,15 @@ class GitHubManager:
         """
         DBM.i("Setting README contents as action output...")
         if "GITHUB_OUTPUT" not in environ.keys():
-            raise Exception("Not in GitHub environment ('GITHUB_OUTPUT' not defined)!")
+            DBM.p("Not in GitHub environment, not setting action output!")
+            return False
 
         prefix = "README stats current output:"
         eol = "".join(choice(ascii_letters) for _ in range(10))
         FM.write_file(environ["GITHUB_OUTPUT"], f"README_CONTENT<<{eol}\n{prefix}\n\n{stats}\n{eol}\n", append=True)
 
         DBM.g("Action output set!")
+        return True
 
     @staticmethod
     def update_chart(chart_path: str) -> str: