First round of patches to re-enable some lints from my side.
This PR also refactors the general key fetching code quite a bit due to the way it currently worked
with relying on some values being nil sometimes.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11253
Reviewed-by: elle <0xllx0@noreply.codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: famfo <famfo@famfo.xyz>
Co-committed-by: famfo <famfo@famfo.xyz>
