Add config validation option

[viceice]

see renovatebot/renovate#547

Idea:

• Add command option, which is renovate by default and can be validate for validation mode
• Add optional validateFiles options for additional files to validate (colon / pipe separated glob patterns)

[mu88]

@viceice: as of now, is there any workaround to run the config validation via renovatebot/github-action? At the moment, I'm doing it like this:

      - name: Validate Renovate configuration
        run: >
          docker run -t
          -v ${{ env.RENOVATE_REPO_CONFIG_FILE_PATH }}:/renovate.json5
          renovate/renovate:41
          renovate-config-validator /renovate.json5
          | tee renovate_validation.log
      - name: Check Renovate validation log for problems
        run: |
          if ! grep -vqzE 'validationError|ERROR\:|FATAL\:' renovate_validation.log; then
            echo "Renovate validation problems found, check the log for details."
            exit 1
          else
            echo "No Renovate validation problems found."
          fi

[viceice]

no, not yet implemented

[mu88]

But it's safe to assume that a full Renovate run does also validate the config, right? So by not running renovate-config-validator, I don't lose any validations, correct?