chore: Fix build of open-lens

- Remove need for using relative paths during build

Signed-off-by: Sebastian Malton <sebastian@malton.name>

open-lens/webpack/vars.ts

@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) OpenLens Authors. All rights reserved.
+ * Licensed under MIT License. See LICENSE in root directory for more information.
+ */
+
+import assert from "assert";
+import path from "path";
+
+export const isDevelopment = process.env.NODE_ENV !== "production";
+export const mainDir = path.join(process.cwd(), "src", "main");
+export const buildDir = path.join(process.cwd(), "static", "build");
+export const assetsFolderName = "assets";
+export const rendererDir = path.join(process.cwd(), "src", "renderer");
+export const publicPath = "/build/";
+export const webpackDevServerPort = Number(process.env.WEBPACK_DEV_SERVER_PORT) || 9191;
+
+// TODO: Figure out a way to access these without relative paths
+export const htmlTemplate = require.resolve("@k8slens/core/template.html");
+export const sassCommonVars = require.resolve("@k8slens/core/vars.scss");
+
+assert(Number.isInteger(webpackDevServerPort), "WEBPACK_DEV_SERVER_PORT environment variable must only be an integer");