testing/kubernetes: disabled build since go 1.13 is not supported

The issue is being tracked here:
https://github.com/kubernetes/kubernetes/issues/83124

Waiting for go 1.13.2 upgrade to re-enable go

testing/kubernetes/APKBUILD

@@ -4,10 +4,11 @@
 # Maintainer: Francesco Colista <fcolista@alpinelinux.org>
 pkgname=kubernetes
 pkgver=1.15.3
-pkgrel=1
+pkgrel=2
 pkgdesc="Container Cluster Manager for Docker"
 url="https://kubernetes.io/"
-arch="x86_64 armhf"
+#arch="x86_64 armhf"
+arch=""
 license="Apache-2.0"
 options="!check" # Tests hang
 depends="bash"
@@ -84,6 +85,11 @@ _kubeadm() {
 	mv "$pkgdir"/usr/bin/kubeadm "$subpkgdir"/usr/bin
 }
 
+cleanup_srcdir() {
+	go clean -modcache
+	default_cleanup_srcdir
+}
+
 sha512sums="b4c3f65f7ae6c9b3e1bb8efd5182a0c922e372c0b8db77b71cd52025c7a00f592ad450c042d78b1d54b716c328c0b291296b36c102579a416b9cd8dda1be8ad2  kubernetes-1.15.3.tar.gz
 bfe072d2f53543b8d704319755f3cfe5ed2467b54879e22117a25a9d7d6d4d238356e45824deaf4d18b8e9eb6f34d1de43be4840b9906f7909478ffe9e8a65ff  ensure-cgo-usage.patch
 8faa8f1c777740ed33ac4e46e8e47e9092098b6e672cf57a10caab2212b9b5c6965361fe7107d1311227e6145e2ad312982dc0340feb36b03ebb04e1202366f0  make-e2e_node-run-over-distro-bins.patch