* build(appimage): pin the interpreter, packages and tooling
* ci(appimage): build inside a pinned ubuntu 22.04 image
* test(appimage): guard the pins and the base image
* docs: state the AppImage glibc floor
* fix(appimage): bundle libibus with its typelib
* ci(appimage): let the container run the isolated GI smoke test
* fix(appimage): keep the bundle's libraries out of host binaries
* fix(appimage): bundle libgpg-error with the libgcrypt that needs it
* docs(agents): require host_env() for spawned binaries
* ci: run the AppImage jobs when its other inputs change
* fix(appimage): check every bundled typelib, not just the seeded ones
* fix(ibus): keep the bundle when respawning our own interpreter
* fix(injection): pass host_env() to setxkbmap and notify-send
* test(ibus): wait for the IBus warmup thread before asserting
