ci: adding an arkscript formatting step

.github/workflows/ci.yml

@@ -42,6 +42,29 @@ jobs:
           check-path: ${{ matrix.path }}
           fallback-style: 'Mozilla' # optional
 
+  check_ark:
+    name: ArkScript formatting check
+    runs-on: ubuntu-24.04
+
+    strategy:
+      fail-fast: false
+      matrix:
+        path:
+          - /src/examples
+          - /src/tests/arkscript
+
+    container:
+      image: arkscript/nightly
+      volumes:
+        - ${{ github.workspace }}:/src
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Format check
+        uses: ./.github/workflows/format-check-arkscript
+        with:
+          folder: ${{ matrix.path }}
+
   repo_visualizer:
     runs-on: ubuntu-24.04
     needs: [ check ]

.github/workflows/format-check-arkscript/action.yaml

@@ -0,0 +1,22 @@
+---
+name: 'Format check ArkScript code'
+description: 'Given a folder, find all .ark files and check that they are correctly formatted'
+inputs:
+  folder:
+    description: 'Folder with .ark files to check'
+    required: true
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Check
+      shell: sh
+      run: |
+        failures=0
+        while read -rd $'\0' file; do
+          if ! arkscript --format "$file" --check; then
+            echo "❌ $(basename $file) is not formatted correctly"
+            failures=$((failures+1))
+          fi
+        done < <(find "${{ inputs.folder }}" -type f -name "*.ark" -print0)
+        [ $failures -gt 0 ] && exit 1