Ci: add ESLint (#234)

* ci: renamed for general tests and checks

* ci: add eslint test

* ci: rename test file

.github/workflows/validate-schemas.yml → .github/workflows/tests.yml

@@ -1,4 +1,4 @@
-name: Validate JSONs on PR
+name: Tests
 on: [pull_request]
 jobs:
   validate_schemas:
@@ -12,3 +12,19 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           json_schema: ./schemas/people-schema.json
           json_path_pattern: ^people/.+\.json$
+  eslint:
+    name: ESLint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint