Allow user to select Kubeconfig from filesystem (#740)

* Allow user to select Kubeconfig from filesystem, fix #738

Signed-off-by: Roman <ixrock@gmail.com>

Co-authored-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>
Co-authored-by: Alex Andreev <alex.andreev.email@gmail.com>

src/common/utils/saveToAppFiles.ts

@@ -0,0 +1,11 @@
+// Save file to electron app directory (e.g. "/Users/$USER/Library/Application Support/Lens" for MacOS)
+import path from "path";
+import { app, remote } from "electron";
+import { ensureDirSync, writeFileSync } from "fs-extra";
+
+export function saveToAppFiles(filePath: string, contents: any): string {
+  const absPath = path.resolve((app || remote.app).getPath("userData"), filePath);
+  ensureDirSync(path.dirname(absPath));
+  writeFileSync(absPath, contents);
+  return absPath;
+}