Merge pull request 'Modernise & make fun' (#3) from asch/modernise into main

Reviewed-on: https://home.schmelczer.dev/git/git/andras/decla-red/pulls/3

.forgejo/workflows/deploy.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 14
+          node-version-file: .nvmrc
 
       - name: Install dependencies
         # No lockfiles are committed (see .gitignore), so use `npm install`.
@@ -32,6 +32,12 @@ jobs:
       - name: Build (shared -> frontend -> backend)
         run: npm run build
 
+      - name: Test
+        run: npm test
+
+      - name: Lint
+        run: npm run lint:check
+
       - name: Deploy to host pages mount
         if: github.event_name == 'push' && github.ref == 'refs/heads/main'
         uses: http://forgejo:3000/andras/ci-actions/deploy-pages@main