ci: create PR to udpate flake.lock every saturday

[brianmay]

If this works it should create PRs that look a bit like https://github.com/brianmay/robotica-rust/pull/701

Caveats:

• Might have problems because I didn't create a personal token. Hoping this won't be required, but for personal project found it was. Particularly with dependabot. See https://github.com/DeterminateSystems/update-flake-lock?tab=readme-ov-file#with-a-personal-authentication-token
• Might have implications for running out of cache space, see #4297.
• Not sure what timezone this cron job uses.

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[brianmay]

There is a request for native nix flake support in dependabot, but don't hold your breath waiting for it to happen :-)

https://github.com/dependabot/dependabot-core/issues/7340 https://github.com/NixOS/nix/issues/9823

[brianmay]

Thanks for the feedback. I agree with all points raised.

[brianmay]

Hopefully I addressed all the feedback.

I left the DeterminateSystems/nix-installer-action@main open though so you can read what I said :-)

Obviously this has not been tested...

[JakobLichterfeld]

As feared, there are access problems: https://github.com/teslamate-org/teslamate/actions/runs/11813145746/job/32909622410#step:4:913

[JakobLichterfeld]

Ok, with c673ef3 we are getting closer:

https://github.com/teslamate-org/teslamate/actions/runs/11813338621/job/32910192341#step:4:921

[JakobLichterfeld]

I changed our org settings:

And now it succeed: https://github.com/teslamate-org/teslamate/actions/runs/11813473229/job/32910586733

--> #4381

[brianmay]

Great!