coreos: Add a user patch for app-portage/gentoolkit

Fixes an issue I had when working on package updates automation.

sdk_container/src/third_party/coreos-overlay/coreos/user-patches/app-portage/gentoolkit/0001-profile-Default-to-main-repo-name.patch

@@ -0,0 +1,53 @@
+From e40cd8c76bee4f7c108c1066d60aaf5d8c3adede Mon Sep 17 00:00:00 2001
+From: Krzesimir Nowak <knowak@microsoft.com>
+Date: Thu, 8 Dec 2022 16:25:39 +0100
+Subject: [PATCH] profile: Default to main repo name
+
+In Flatcar we have a different repo marked as a default one
+(portage-stable), so "equery keywords" was crashing because it was
+trying to use gentoo repo anyways.
+
+Signed-off-by: Krzesimir Nowak <knowak@microsoft.com>
+Closes: https://github.com/gentoo/gentoolkit/pull/24
+Signed-off-by: Sam James <sam@gentoo.org>
+---
+ pym/gentoolkit/profile.py | 13 ++++++++++---
+ 1 file changed, 10 insertions(+), 3 deletions(-)
+
+diff --git a/pym/gentoolkit/profile.py b/pym/gentoolkit/profile.py
+index dcd02cc..c880137 100644
+--- a/pym/gentoolkit/profile.py
++++ b/pym/gentoolkit/profile.py
+@@ -23,19 +23,26 @@ def warning(msg):
+ 	print('warning: %s' % msg, file=sys.stderr)
+ 
+ 
+-def load_profile_data(portdir=None, repo='gentoo'):
++def load_profile_data(portdir=None, repo=''):
+ 	"""Load the list of known arches from the tree
+ 
+ 	Args:
+ 	  portdir: The repository to load all data from (and ignore |repo|)
+-	  repo: Look up this repository by name to locate profile data
++	  repo: Look up this repository by name to locate profile data (if empty, uses main repo name)
+ 
+ 	Returns:
+ 	  A dict mapping the keyword to its preferred state:
+ 	  {'x86': ('stable', 'arch'), 'mips': ('dev', '~arch'), ...}
+ 	"""
+ 	if portdir is None:
+-		portdir = portage.db[portage.root]['vartree'].settings.repositories[repo].location
++		repos = portage.db[portage.root]["vartree"].settings.repositories
++		if repo == "":
++			main_repo = repos.mainRepo()
++			if main_repo is None:
++				repo = "gentoo"
++			else:
++				repo = main_repo.name
++		portdir = repos[repo].location
+ 
+ 	arch_status = {}
+ 
+-- 
+2.25.1
+

sdk_container/src/third_party/coreos-overlay/coreos/user-patches/app-portage/gentoolkit/README.md

@@ -0,0 +1 @@
+Drop `0001-profile-Default-to-main-repo-name.patch` when we have gentoolkit 0.6.2 or greater.