allow testing katello from a branch

[evgeni]

What are the changes introduced in this pull request?

Considerations taken when implementing this change?

What are the testing steps for this pull request?

Summary by Sourcery

Build:

• Make the Katello gem source branch configurable through the KATELLO_BRANCH environment variable.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Configures the Katello gem dependency to select its GitHub branch via the KATELLO_BRANCH environment variable, defaulting to master when not set.

Flow diagram for Katello gem branch selection via environment variable

flowchart TD
    A[Bundle install / app boot] --> B[Evaluate katello gem source]
    B --> C{Is KATELLO_BRANCH set?}
    C -->|Yes| D[Use katello GitHub repo branch KATELLO_BRANCH]
    C -->|No| E[Use katello GitHub repo branch master]
    D --> F[Katello gem resolved]
    E --> F[Katello gem resolved]

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File-Level Changes

Change	Details	Files
Make the Katello gem use an environment-variable-controlled branch instead of a hard-coded master branch.	Replaced the hard-coded 'master' branch specification for the Katello gem with an ENV.fetch lookup. Defaulted the Katello gem branch to 'master' when the KATELLO_BRANCH environment variable is not present.	gemfile.d/katello.rb

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[jeremylenz]

I have PTSD from relying on environment variables, but I guess this is fine since it's not production :)