fix(developer): use path not dependent on pwd for starting Server

developer/src/server/src/environment.ts

@@ -1,5 +1,25 @@
+/*
+ * Keyman is copyright (C) SIL Global. MIT License.
+ *
+ * Environmental variables and paths
+ */
+import path from 'node:path';
 import { extractVersionData } from './version-data.js';
 // TODO: environment should be just KEYMAN_VERSION
 
 import KEYMAN_VERSION from "@keymanapp/keyman-version";
 export const environment = extractVersionData(KEYMAN_VERSION.VERSION_WITH_TAG);
+
+/**
+ * @returns base path for the running server -- where index.js is stored
+ */
+export function serverBasePath() {
+  return path.join(import.meta.dirname, '../../build/src');
+}
+
+/**
+ * @returns path where the site public files can be found -- index.html
+ */
+export function serverSitePath() {
+  return path.join(serverBasePath(), 'site');
+}

developer/src/server/src/routes.ts

@@ -1,3 +1,8 @@
+/*
+ * Keyman is copyright (C) SIL Global. MIT License.
+ *
+ * Setup URL routes for Keyman Developer Server
+ */
 import * as express from 'express';
 import * as ws from 'ws';
 import * as multer from 'multer';
@@ -16,6 +21,7 @@ import { standardPaths } from './standardPaths.js';
 import chalk from 'chalk';
 import { shutdown } from './shutdown.js';
 import { getOption } from './options.js';
+import { serverSitePath } from './environment.js';
 
 export default function setupRoutes(app: express.Express, upload: multer.Multer, wsServer: ws.WebSocketServer, environment: Environment ) {
 
@@ -51,7 +57,7 @@ export default function setupRoutes(app: express.Express, upload: multer.Multer,
 
   /* All routes */
 
-  app.use('/', express.static('build/src/site'));
+  app.use('/', express.static(serverSitePath()));
 
   app.post('/upload', localhostOnly, upload.single('file'), (req, res, next) => {
     const name = req.file.originalname;