Name already in use

Bump sinatra from 2.0.5 to 2.2.3

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.0.5 to 2.2.3.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](sinatra/sinatra@v2.0.5...v2.2.3)

---
updated-dependencies:
- dependency-name: sinatra
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Allow up to 100 CI checks for CI status command

I'm working on a project that has a complex CI setup, and reaches more
than 30. Sometimes `hub ci-status` would report success when it was
still pending, which was very annoying.

per_page=100 is used in many other queries, and is the maximum that is
allowed without paging.

Explicitly setting `hub.protocol` to `git` or using `HUB_PROTOCOL=git`
still uses the `git` protocol.

Co-authored-by: Mislav Marohnić <mislav@github.com>

Fix CI

This was fun and everything, but the patch makes it tricky to upgrade Aruba, so
it should go for now.

various docfile updates

📝 Add Nix installation to README

github: fix unbuffered channel passed to signal.Notify

The docs at os/signal.Notify warn about this signal delivery loss bug at
https://golang.org/pkg/os/signal/#Notify, which says:

    Package signal will not block sending to c: the caller must ensure
    that c has sufficient buffer space to keep up with the expected signal
    rate. For a channel used for notification of just one signal value,
    a buffer of size 1 is sufficient.

Caught by a static analysis tool from Orijtech, Inc. called "sigchanyzer"

Fixes #2616

fix: Update checkout and cache to v2

Fix parsing boolean flags with explicit values

Fixes #2590

Avoid literal mention of "GitHub CLI" because hub already ranks too high
for those search terms and we don't want it to rank any higher.

Closes #2458