Having the same problem with my install, I am running my HASS within a VM on proxmox,
Home Assistant OS 5.12
supervisor-2021.03.6
core-2021.3.4
What is interesting is the error has change from cant find repository to connection refused
21-03-24 19:39:59 INFO (MainThread) [supervisor.store.git] Update add-on https://github.com/hassio-addons/repository repository
21-03-24 19:39:59 ERROR (MainThread) [supervisor.store.git] Can't update https://github.com/home-assistant/addons repo: Cmd('git') failed due to: exit code(128)
cmdline: git fetch --depth=1 --update-shallow -v origin
stderr: 'fatal: unable to access 'https://github.com/home-assistant/addons/': Failed to connect to github.com port 443: Connection refused'.
21-03-24 19:39:59 INFO (MainThread) [supervisor.resolution.module] Create new issue IssueType.CORRUPT_REPOSITORY - ContextType.STORE / core
21-03-24 19:39:59 INFO (MainThread) [supervisor.resolution.module] Create new suggestion SuggestionType.EXECUTE_RESET - ContextType.STORE / core
21-03-24 19:40:00 ERROR (MainThread) [asyncio] Task exception was never retrieved
future: <Task finished name='Task-1081' coro=<Repository.update() done, defined at /usr/src/supervisor/supervisor/store/repository.py:105> exception=StoreGitError()>
Traceback (most recent call last):
File "/usr/src/supervisor/supervisor/store/git.py", line 155, in pull
await self.sys_run_in_executor(
File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 57, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/local/lib/python3.8/site-packages/git/remote.py", line 796, in fetch
res = self._get_fetch_info_from_stderr(proc, progress)
File "/usr/local/lib/python3.8/site-packages/git/remote.py", line 674, in _get_fetch_info_from_stderr
proc.wait(stderr=stderr_text)
File "/usr/local/lib/python3.8/site-packages/git/cmd.py", line 408, in wait
raise GitCommandError(self.args, status, errstr)
git.exc.GitCommandError: Cmd('git') failed due to: exit code(128)
cmdline: git fetch --depth=1 --update-shallow -v origin
stderr: 'fatal: unable to access 'https://github.com/home-assistant/addons/': Failed to connect to github.com port 443: Connection refused'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/src/supervisor/supervisor/store/repository.py", line 109, in update
await self.git.pull()
File "/usr/src/supervisor/supervisor/jobs/decorator.py", line 102, in wrapper
raise err
File "/usr/src/supervisor/supervisor/jobs/decorator.py", line 100, in wrapper
return await self._method(*args, **kwargs)
File "/usr/src/supervisor/supervisor/store/git.py", line 195, in pull
raise StoreGitError() from err
supervisor.exceptions.StoreGitError
??
