diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index b2f8a8d..426dcea 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -51,10 +51,17 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: '19.x'
+          node-version: '19.6.0'
       - run: yarn
         working-directory: ./web
       - run: yarn check-lint
         working-directory: ./web
       - run: yarn check-types
         working-directory: ./web
+      - run: yarn build-export        # Build frontend
+        working-directory: ./web
+      - run: |                        # Check for clean working dir
+          if ! git diff --exit-code; then
+            exit 1
+          fi
+
diff --git a/Dockerfile b/Dockerfile
index 7971aab..b77d6c4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Install dependencies only when needed
-FROM node:lts-alpine AS build_frontend
+FROM node:19.6.0-alpine AS build_frontend
 # Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
 RUN apk add --no-cache libc6-compat
 WORKDIR /app