下記は console.log() , FIXME を含んでいたら CI を落とす例。

検索ワードやディでクトリは適宜書き換えてください。

name: NG words

on: [push, pull_request]

jobs:
  check-console:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: |
          if grep -rE "console\.log\(" ./src; then
               exit 1
          else
              echo "All good"
          fi
  check-fixme:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: |
          if grep -rE "FIXME" ./src; then
               exit 1
          else
              echo "All good"
          fi