The GitHub App was the one piece of a Coolify instance cast could not
reproduce. There is no REST endpoint that creates one — no POST /apps, no
GraphQL mutation, no `gh app` subcommand, no PAT scope — so `create` runs the
only programmatic path there is: GitHub's App Manifest flow, a one-shot page
served on 127.0.0.1 whose form POST the operator's own browser session
authenticates, followed by an unauthenticated code exchange.
That exchange is the only moment GitHub yields the private key, the client
secret and the webhook secret together; all three are persisted to
<state>/github-apps/ at 0600 under a .gitignore of `*`.
`create` does not reimplement `register`: it obtains credentials and then calls
exactly that path. Both verbs end at GET /github-apps/{id}/repositories,
asserting the repo is actually reachable — the check that turns a silent
misconfiguration into an error next to the thing that caused it.
github_apps.<org>/<repo> in environments.yaml (--name only seeds an absent
entry, and is refused when it disagrees), the client secret is stdin-only, and
--webhook-secret is optional. scripts/register-github-app.sh is deleted.
No new dependencies: node:http for the callback, node:crypto's
createSign("RSA-SHA256") for the App JWT that recovers the installation id from
the App's own key rather than from a spoofable redirect parameter.
Closes#7
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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