repo: Add basic linting (#4)

Signed-off-by: Ryan Northey <ryan@synca.io>

Author: phlax

.github/workflows/lint.yml

@@ -0,0 +1,28 @@
+name: Lint
+
+permissions:
+  contents: read
+
+on:
+  pull_request:
+  push:
+    branches:
+    - main
+
+concurrency:
+  group: >-
+    ${{ github.event.inputs.head_ref || github.run_id }}
+
+
+jobs:
+  lint:
+    runs-on: ubuntu-24.04
+    if: github.repository_owner == 'envoyproxy'
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+    - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  # v5.6.0
+      with:
+        python-version: "3.12"
+    - run: |
+        pip install -r ./.github/workflows/requirements.txt
+        envoy.code.check . -c glint python_flake8 shellcheck yamllint -x single-page-app/_github-clusters.yml

.github/workflows/requirements.in

@@ -0,0 +1,3 @@
+aiohttp>=3.11.6
+envoy.code.check
+yarl>=1.17.2