fix: install docker-compose when compose-version is specified

[jmpargana]

Context

This PR fixes issue #232, where the action fails on self-hosted runners that have Docker installed but do not have Docker Compose, even when compose-version is explicitly provided.

Root cause

The logic responsible for setting up Docker Compose did not properly handle the case where:

• Docker Compose is not installed, and
• compose-version is specified.

Instead of installing Docker Compose, the action proceeded without error handling before checking or installing.

Changes introduced

• Ensure Docker Compose is installed when compose-version is provided, regardless of runner type (hosted or self-hosted).

Related issue

Closes #232

[neilime]

@jmpargana can you run make ci to ensure the code is ready for CI

Thanks

[jmpargana]

@jmpargana can you run make ci to ensure the code is ready for CI

Thanks

@neilime thanks for looking into it. I had failed to rebase with main also. Now it has the generated index.js and make ci passes locally. The only thing failing in the CI is a missing permission for the OIDC token.

Is there something I can do locally?

[neilime]

Thanks @jmpargana for your contribution