需求：不想每次提交都触发Github Actions构建，只有git commit message不包含指定的内容才触发

Github Actions 支持 jobs.<job_id>.if (opens new window) 语法 Github Actions运行中我们可以拿到一些当前的环境信息，比如git的提交内容信息，通过这些内容来控制actions的执行

比如，当git message不包含wip才触发构建

jobs:
  format:
    runs-on: ubuntu-latest
    if: "! contains(github.event.head_commit.message, 'wip')"

同理，下面的workflow表示，只有git message中包含[build]才触发构建，否则跳过

jobs:
  format:
    runs-on: ubuntu-latest
    if: "contains(github.event.head_commit.message, '[build]')"

具体的信息我们可以全部打印出来，修改workflow文件,添加steps

on: push

jobs:
  one:
    runs-on: ubuntu-latest
    steps:
      - name: Dump GitHub context
        env:
          GITHUB_CONTEXT: ${{ toJson(github) }}
        run: echo "$GITHUB_CONTEXT"
      - name: Dump job context
        env:
          JOB_CONTEXT: ${{ toJson(job) }}
        run: echo "$JOB_CONTEXT"
      - name: Dump steps context
        env:
          STEPS_CONTEXT: ${{ toJson(steps) }}
        run: echo "$STEPS_CONTEXT"
      - name: Dump runner context
        env:
          RUNNER_CONTEXT: ${{ toJson(runner) }}
        run: echo "$RUNNER_CONTEXT"
      - name: Dump strategy context
        env:
          STRATEGY_CONTEXT: ${{ toJson(strategy) }}
        run: echo "$STRATEGY_CONTEXT"
      - name: Dump matrix context
        env:
          MATRIX_CONTEXT: ${{ toJson(matrix) }}
        run: echo "$MATRIX_CONTEXT"