Using npm not yarn

.gitignore

@@ -3,5 +3,3 @@ dist/
 service-worker.build.js
 .env
 static/images/mockups
-.yarn/
-bun.lockb

frontend/Dockerfile

@@ -5,7 +5,7 @@ COPY package.json ./
 COPY package-lock.json ./
 RUN npm ci
 COPY . ./
-RUN yarn build
+RUN npm run build
 
 FROM git.webdeploy.it/webdeploy/yarn
 

frontend/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "scripts": {
     "dev": "vite dev",
-    "build": "vite build && yarn add-sigint",
+    "build": "vite build && npm run add-sigint",
     "add-sigint": "./add-sigint.sh",
     "preview": "vite preview",
     "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",