Add formatting/linting CI (#18)

.github/workflows/ci.yml

@@ -1,27 +1,13 @@
 name: CI
 on:
   push:
-    paths:
-      - ".github/workflows/ci.yml"
-      - ".github/workflows/release.yml"
-      - "hatch_build.py"
-      - "package.json"
-      - "pyproject.toml"
-      - "rollup.config.js"
-      - "run.ts"
-      - "src/**"
-      - "yt_dlp_ejs/**"
+    paths-ignore:
+      - 'README.md'
+      - 'LICENSE'
   pull_request:
-    paths:
-      - ".github/workflows/ci.yml"
-      - ".github/workflows/release.yml"
-      - "hatch_build.py"
-      - "package.json"
-      - "pyproject.toml"
-      - "rollup.config.js"
-      - "run.ts"
-      - "src/**"
-      - "yt_dlp_ejs/**"
+    paths-ignore:
+      - 'README.md'
+      - 'LICENSE'
 
 permissions:
   contents: read
@@ -31,6 +17,56 @@ concurrency:
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 jobs:
+  ruff-format:
+    name: Ruff format check
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - uses: astral-sh/ruff-action@v3
+      with:
+        args: "check --output-format github"
+
+  ruff-lint:
+    name: Ruff linting check
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v5
+    - uses: astral-sh/ruff-action@v3
+      with:
+        args: "format --check --diff"
+
+  prettier:
+    name: Prettier check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: Install Deno v2.x (latest)
+        uses: denoland/setup-deno@v2
+        with:
+          deno-version: v2.x
+      - name: Install Deno requirements
+        run: |
+          deno install
+      - name: Run Prettier check
+        run: |
+          deno task fmt:check
+
+  eslint:
+    name: ESLint check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: Install Deno v2.x (latest)
+        uses: denoland/setup-deno@v2
+        with:
+          deno-version: v2.x
+      - name: Install Deno requirements
+        run: |
+          deno install
+      - name: Run ESLint check
+        run: |
+          deno task lint
+
   python_tests:
     name: Python tests
     runs-on: ubuntu-latest
@@ -304,7 +340,17 @@ jobs:
           node --test
 
   all_passed:
-    needs: [deno_build, deno_tests, bun_build, bun_tests, node_build, node_tests]
+    needs:
+      - ruff-format
+      - ruff-lint
+      - prettier
+      - eslint
+      - deno_build
+      - deno_tests
+      - bun_build
+      - bun_tests
+      - node_build
+      - node_tests
     runs-on: ubuntu-latest
     steps:
       - name: All checks passed