Forgejo reported "does not have a signing key" on PRs despite the
forgejo-gpg-init service generating one. Two causes, both fixed:
- SIGNING_KEY = "default" resolves through the forgejo process's git
config (user.signingkey), not by scanning GNUPGHOME — and the keygen
never set it, so "default" found no key. forgejo-gpg-init now sets the
forgejo user's git user.signingkey to the generated key (+ commit and
tag gpgsign), with HOME pinned to the state dir so the global config
lands where forgejo reads it.
- The keygen guard was stamp-file based, so a partial state wipe that
lost the key while keeping the stamp would never regenerate. It's now
keyed on the actual secret key (regenerate iff gpg shows none) and
runs idempotently before forgejo on each start.
Also drops the heredoc for the gpg params in favour of printf (avoids
nix-string indentation fragility) and corrects the stale comment that
claimed "default" scans GNUPGHOME.
d6b95d22f0