ec2-controller: deploy controller without CPU limit

[hoffimar]

Is your feature request related to a problem?
Currently, we're using the helmchart with the schema of the provided schema. Usually I try to not set CPU limits (surely there are discussions about this in general, not being part of this issue), but the schema forbids the setting to null which I tried to use (helm docu about removing a default value).

Error message is:

Reason: Update - Message: unable to upgrade helm chart release: values don't meet the specifications of the schema(s) in the following chart(s):
      ec2-chart:
      - at '/resources/limits': missing property 'cpu'

Describe the solution you'd like
Be able to override the cpu limits with a non-existing values to not set any CPU limit.

Describe alternatives you've considered
none

[github-actions]

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