Rename coordinator to bootstrapper and rename roles

bootstrapper/internal/kubernetes/kubeconfig.go

@@ -0,0 +1,23 @@
+package kubernetes
+
+import (
+	"fmt"
+
+	"github.com/spf13/afero"
+)
+
+const kubeconfigPath = "/etc/kubernetes/admin.conf"
+
+// KubeconfigReader implements ConfigReader.
+type KubeconfigReader struct {
+	fs afero.Afero
+}
+
+// ReadKubeconfig reads the Kubeconfig from disk.
+func (r KubeconfigReader) ReadKubeconfig() ([]byte, error) {
+	kubeconfig, err := r.fs.ReadFile(kubeconfigPath)
+	if err != nil {
+		return nil, fmt.Errorf("reading gce config: %w", err)
+	}
+	return kubeconfig, nil
+}