ensure passed context is used

[nabuskey]

Purpose of this PR

Currently, the controller uses context.Todo in its main logic, it's usually a better practice to use passed in context if available, instead of using the background context. This will allow it to set context on start up and use the same context in the future.

Proposed changes:

• Replace context.Todo() with passed in context.

Change Category

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

Checklist

• I have conducted a self-review of my own code.
• I have updated documentation accordingly.
• I have added tests that prove my changes are effective or that my feature works.
• Existing unit tests pass locally with my changes.

Additional Notes

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChenYi015

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[ChenYi015]

@nabuskey Thanks for improving the code quality!
/lgtm