ci: update dockerfiles for mbedTLS new url

Update the new URL for mbedTLS.

CI: limits actions scheduled workflows to the main repo

Only run scheduled workflows on the main repository; prevents people
from using build minutes on their forks.

filter: Fix Segfault

Co-authored-by: Edward Thomson <ethomson@github.com>

repo: allow administrator to own the configuration

status: update documentation for default options

config: update config entry iteration lifecycle

Update our ownership checks that were introduced in libgit2 v1.4.3
(to combat CVE 2022-24765). These were not compatible with git's; git
itself allows administrators to own the path. Our checks now match
this behavior.

Look for `getentropy` and flag its existence.

transport: introduce `git_transport_smart_remote_connect_options`

Snuck in during refactoring; let's get rid of it.

A couple of simplications around mwindow

Add a .clang-format with our style

Co-authored-by: Edward Thomson <ethomson@github.com>

CLI: progress updates

refs: fix missing error message

docs: fix couple of typos

revparse: Remove error-prone, redundant test

midx: do not verify the checksum on load

Avoid too much flashing on the console with updates about throughput.
Only update throughput once a second.

Include test results data in CI

midx: fix large offset table check.

Add link to Tcl bindings for libgit2

chore(docs): Add Pharo to language bindings