Add the possibility to set a container image option

[yannickmonney]

In order to have the possibility to use a specific container image, could we add the container image option?

jobs:
  job:
    container:
      image: ${{ ... }}

For more information, see: https://docs.github.com/en/actions/using-jobs/running-jobs-in-a-container

Additionally, timeout-minutes could we add this one too?

[meeroslav]

We want to keep this workflow light and as basic as possible.

For any specific use cases not covered by the existing functionality, we suggest creating you own custom workflow.

The timeout-minutes will be merged soon. Thank you