feat: full rootless setup (#165)

* use local devtools configs instead of global ones

* make docker image rootless

* add migration notes

* fix setup command

* fix regress jo

tests/testresources/core/ahriman.ini

@@ -23,6 +23,7 @@ allow_read_only = no
 
 [build]
 archbuild_flags =
+devtools_configs = .
 devtools_wrapper = ahriman-archbuild
 ignore_packages =
 makechrootpkg_flags =