kubernetes: allow go 1.20 building

Although k8s checks for, and demands, golang 1.21.x, runtime
tests show that golang 1.20.x is properly building and providing
enough for core functionality.

In an effort to see what else may be lurking, we patch out the
check to allow builds with our 1.20.x toolchain.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

recipes-containers/kubernetes/kubernetes/0001-build-hack-allow-go-1.20-building.patch

@@ -0,0 +1,35 @@
+From 6f67131b030c4c228cabb33d45ae9330cbf8fa0a Mon Sep 17 00:00:00 2001
+From: Bruce Ashfield <bruce.ashfield@gmail.com>
+Date: Tue, 27 Feb 2024 18:05:54 +0000
+Subject: [PATCH] build/hack: allow go 1.20 building
+
+Although k8s checks for, and demands, golang 1.21.x, runtime
+tests show that golang 1.20.x is properly building and providing
+enough for core functionality.
+
+In an effort to see what else may be lurking, we patch out the
+check to allow builds with our 1.20.x toolchain.
+
+Upstream-Status: Inappropriate [embedded specific]
+
+Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
+---
+ hack/lib/golang.sh | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/hack/lib/golang.sh b/hack/lib/golang.sh
+index 588288285bb..eb2bcc917b8 100755
+--- a/hack/lib/golang.sh
++++ b/hack/lib/golang.sh
+@@ -499,7 +499,7 @@ Detected go version: ${go_version[*]}.
+ Kubernetes requires ${minimum_go_version} or greater.
+ Please install ${minimum_go_version} or later.
+ EOF
+-    return 2
++    return 0
+   fi
+ }
+ 
+-- 
+2.39.2
+

recipes-containers/kubernetes/kubernetes_git.bb

@@ -30,6 +30,7 @@ SRC_URI:append = " \
            file://0001-hack-lib-golang.sh-use-CC-from-environment.patch \
            file://0001-cross-don-t-build-tests-by-default.patch \
            file://0001-build-golang.sh-convert-remaining-go-calls-to-use.patch \
+           file://0001-build-hack-allow-go-1.20-building.patch \
            file://cni-containerd-net.conflist \
            file://k8s-init \
            file://99-kubernetes.conf \