Gitea Action fails to run and install yamllint

Question

Trying to validate YAML files. Why is below code not able to work?

• Scenario 1:

    validate-yaml:
      runs-on: python-test   ##  a python:latest image 
      steps:
        - run: pip install yamllint
        - run: yamllint  ../../.
  

  Error:  unable to reach pip
  

• Scenario 2:

    validate-yaml:
      runs-on: python-lint   ## registry.gitlab.com/pipeline-components/yamllint:latest  an image with lini installed
      steps:
        - run: yamllint  ../../.
  

  Error: OCI runtime exec failed: exec failed: unable to start container process: exec: "bash": executable file not found in $PATH: unknown