Try with build.js

.github/workflows/preview.yml

@@ -30,7 +30,9 @@ jobs:
       - name: Build
         run: |
           npm install
-          ./hugo/scripts/build.sh production "/pr-${{github.event.number}}"
+          npm run build
+        env:
+          BASE_URL: /pr-${{github.event.number}}
       - name: Upload artifact
         uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
         with:

hugo/package.json

@@ -18,7 +18,7 @@
     "build:worker/sql": "esbuild ./assets/scripts/sql/language-server.ts --bundle --format=iife --outfile=./static/showcase/libs/worker/sqlServerWorker.js",
     "build:worker/minilogo": "esbuild ../node_modules/langium-minilogo/out/language-server/main-browser.js --bundle --format=iife --outfile=./static/showcase/libs/worker/minilogoServerWorker.js",
     "build:static": "npm run clean:static && npm run build:worker/statemachine && npm run build:worker/domainmodel && npm run build:worker/sql && npm run build:worker/minilogo && npm run build:worker/arithmetics && npm run build:worker/playground-common && npm run build:worker/playground-langium && npm run build:worker/playground-user && npm run copy:monaco-workers",
-    "build": "./scripts/build.sh production /",
+    "build": "npm run build:static && node ./scripts/build.js",
     "watch": "npm run build:static && cross-env NODE_ENV=development hugo server --config ./config.toml -D -b localhost:1313 -d ../public --appendPort=false",
     "watch:gitpod": "npm run build:static && cross-env NODE_ENV=development hugo server --config ./config.toml -D -b `gp url 1313` -d ../public --appendPort=false"
   },

hugo/scripts/build.js

@@ -0,0 +1,29 @@
+import cp from 'child_process';
+import { dirname, resolve } from 'path';
+
+const baseUrl = getBaseUrl();
+console.log(`Building website for location '${baseUrl}'...`);
+performHugoBuild(baseUrl);
+
+function getBaseUrl() {
+    return process.env['BASE_URL'] || '/';
+}
+
+function performHugoBuild(rootDir) {
+    const executable = resolve(dirname(process.execPath), 'npm');
+    cp.spawnSync(executable, [
+        'exec',
+        '--', 'hugo',
+        '--config', 'config.toml', 
+        '-b', rootDir,
+        '-d', '../public',
+        '--gc',
+        '--minify'
+    ], {
+        env: {
+            NODE_ENV: "production"
+        },
+        shell: true,
+        stdio: 'inherit'
+    });
+}