feat(controller): add --configmap-name flag to override controller ConfigMap

[a1exx-k]

Summary

• The controller ConfigMap name was hardcoded to argo-rollouts-config with no way to override it at runtime
• Adds a --configmap-name flag to the argo-rollouts-controller binary so operators can specify an alternative name
• Useful when running multiple controller instances in the same namespace, or when the default name conflicts with existing resources

Resolves #4665

Changes

• cmd/rollouts-controller/main.go: new --configmap-name flag (default: argo-rollouts-config)
• controller/controller.go: NewManager and NewAnalysisManager accept a rolloutsConfigMapName string parameter, replacing the hardcoded defaults.DefaultRolloutsConfigMapName constant at the call sites
• controller/controller_test.go: updated call sites to pass defaults.DefaultRolloutsConfigMapName

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional with a list of types and scopes found here, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• My builds are green. Try syncing with master if they are not.
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• I have run all tests locally (including the flaky ones) and they pass on my workstation
• I have used LLM/AI/Agent tools for this PR but I am responsible for all code of this PR
• I understand what the code does and WHY/HOW it works in several scenarios
• I know if my code is just adding new functionality or changing old functionality for existing users
• My organization is added to USERS.md.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.89%. Comparing base (16d28f8) to head (2c0c631).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4664   +/-   ##
=======================================
  Coverage   84.89%   84.89%           
=======================================
  Files         164      164           
  Lines       18966    18973    +7     
=======================================
+ Hits        16101    16108    +7     
  Misses       2005     2005           
  Partials      860      860           

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[github-actions]

Published E2E Test Results

  4 files    4 suites   3h 45m 1s ⏱️
120 tests 107 ✅  7 💤  6 ❌
490 runs  452 ✅ 28 💤 10 ❌

For more details on these failures, see this check.

Results for commit 2c0c631.

♻️ This comment has been updated with latest results.

[github-actions]

Published Unit Test Results

2 454 tests   2 454 ✅  3m 19s ⏱️
  129 suites      0 💤
    1 files        0 ❌

Results for commit 2c0c631.

♻️ This comment has been updated with latest results.

[a1exx-k]

@zachaller - could you please review this change?

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud