Try to fix it by adding a dedicated script

.github/workflows/preview.yml

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

hugo/package.json

@@ -18,9 +18,8 @@
     "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",
-    "preview": "npm run build:static && cross-env NODE_ENV=production  hugo        --config ./config.toml    -b $BASE_URL      -d ../public --gc --minify",
-    "build":   "npm run build:static && cross-env NODE_ENV=production  hugo        --config ./config.toml    -b /              -d ../public --gc --minify",
-    "watch":   "npm run build:static && cross-env NODE_ENV=development hugo server --config ./config.toml -D -b localhost:1313 -d ../public --appendPort=false",
+    "build": "./scripts/build.sh production /",
+    "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"
   },
   "devDependencies": {

hugo/scripts/build.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+cd $(dirname "$0")/..
+npm run build:static && npx cross-env NODE_ENV=${1} hugo --config config.toml -b ${2} -d ../public --gc --minify

package.json

@@ -8,7 +8,6 @@
     "watch": "npm run build --workspace core && concurrently -c gray,blue -k -n hugo,tailwind \"npm run watch --workspace hugo\" \"npm run watch --workspace tailwind\"",
     "watch:gitpod": "npm run build --workspace core && concurrently -c gray,blue -k -n hugo,tailwind \"npm run watch:gitpod --workspace hugo\" \"npm run watch --workspace tailwind\"",
     "build": "npm run clean && npm run build --workspace core --workspace=tailwind --workspace=hugo",
-    "preview": "npm run clean && npm run build --workspace core --workspace=tailwind && npm run preview --workspace hugo",
     "clean": "shx rm -rf public && npm run clean --workspace core --workspace=tailwind"
   },
   "devDependencies": {