Upload sourcemaps for release builds

To allow us to reconstruct a stack trace, this will upload the
sourcemaps for all release builds.

.github/workflows/release.yml

@@ -59,6 +59,12 @@ jobs:
           name: vscode-codeql-extension
           path: artifacts
 
+      - name: Upload source maps
+        uses: actions/upload-artifact@v3
+        with:
+          name: vscode-codeql-sourcemaps
+          path: dist/vscode-codeql/out/*.map
+
         # TODO Run tests, or check that a test run on the same branch succeeded.
 
       - name: Create release

extensions/ql-vscode/gulpfile.ts/webpack.config.ts

@@ -54,6 +54,9 @@ export const config: webpack.Configuration = {
           MiniCssExtractPlugin.loader,
           {
             loader: "css-loader",
+            options: {
+              sourceMap: true,
+            },
           },
         ],
       },