Set CI=true by default

[jamietanna]

Tell us more.

When running Renovate, we execute a number of child commands.

A number of these will perform slightly different things (for instance mise as noted in #43606) when running in a build pipeline/ Continuous Integration (CI) platform, commonly found when the CI=true environment variable is set.

Right now via we'll automagically pass through the CI env var if it's set.

As per discussion in #43606, we could look at enabling this by default for all Renovate users.

This is something we're setting at least for Mend-hosted apps for the @renovatebot org, and has value to be enabled-by-default.

This may be something to consider for the next major release.

[jamietanna]

@viceice thoughts? We set this in the Mend Developer Platform for @renovatebot and @containerbase, so maybe we should make it a default?

[viceice]

I think this makes sense for all

[jamietanna]

#44245