Support for starting job service on condition is met

Describe the enhancement Add support of if: property to jobs.<job-id>.services.<service-id> to start services only in case a condition is met.

Code Snippet

jobs:
  my_job:
    services:
      my_service:
        if: ${{ some expression }}
        ....

[tanguyantoine]

That would be very helpful if you have a shared workflow. We could turn on/off services based on workflow inputs

[ChristopherHX]

I think the following is supported, since https://github.com/actions/runner/commit/3e196355deb87ff9f4c0c0b4643f512e62257bf8 aka v2.299.0 or later

jobs:
  my_job:
    services:
      my_service:
        image: ${{ (some expression) && 'image:tag' || '' }}

It’s very similar to an if, just not so nice to write.