Test formatter in dedicated CI workflow

.github/workflows/ci.yml

@@ -44,7 +44,35 @@ jobs:
 
       - name: Test
         run: |
-          bats --pretty --timing test
+          bats --pretty --timing test --filter-tags !format
+        env:
+          WINDOWS_BASE_DIR: "/d/a"
+          TERM: dumb
+
+  test_format:
+    runs-on: ubuntu-24.04
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: crystal-lang/install-crystal@v1
+        with:
+          crystal: ${{ github.event.inputs.crystal || 'nightly' }}
+          shards: ${{ github.event.inputs.shards || 'nightly' }}
+
+      - name: Setup BATS
+        uses: mig4/setup-bats@v1
+        with:
+          bats-version: 1.9.0
+
+      - name: Configure git to not checkout CRLF
+        run: git config --global --add core.autocrlf false
+
+      - name: Test
+        run: |
+          bats --pretty --timing test --filter-tags format
         env:
           WINDOWS_BASE_DIR: "/d/a"
           TERM: dumb