Cache pre-commit, both pre-commit and virtualenv

ado-pre-commit-cache-all-example.yaml

  - job: precommit
    pool:
      vmImage: ubuntu-latest
    variables:
      PYTHON_VERSION: 3.11
      VENV_ENV_NAME: .venv
      PRE_COMMIT_HOME: $(Pipeline.Workspace)/pre-commit-cache

    steps:
      - task: UsePythonVersion@0
        inputs:
          versionSpec: "$(PYTHON_VERSION)"

      - script: |
          echo "##vso[task.setvariable variable=PY]$(python -VV)"
        displayName: set version variables

      - task: Cache@2
        inputs:
          key: '"$(Agent.OS)" | "$(PythonVersion.pythonLocation)" | requirements.txt'
          restoreKeys: |
            venv | "$(Agent.OS)" | "$(PythonVersion.pythonLocation)"
          path: $(VENV_ENV_NAME)
          cacheHitVar: VENV_CACHE_RESTORED
        displayName: Restore cached pip packages

      - script: |
          pip install virtualenv wheel
          virtualenv $(VENV_ENV_NAME)
        displayName: Setup environment
        condition: eq(variables.VENV_CACHE_RESTORED, 'false')

      - task: Cache@2
        inputs:
          key: pre-commit | .pre-commit-config.yaml | "$(PY)"
          path: $(PRE_COMMIT_HOME)
          restoreKeys: pre-commit | .pre-commit-config.yaml
        displayName: Cache pre-commit

      - script: |
          source $(VENV_ENV_NAME)/bin/activate
          pip install --upgrade pre-commit
        displayName: install pre-commit and requirements

      - script: source $(VENV_ENV_NAME)/bin/activate; pre-commit run --all-files --show-diff-on-failure
        displayName: run pre-commit