fileloader: Add support for query parameters

[logand22]

Eschewed features

• This issue is not requesting templating, unstuctured edits, build-time side-effects from args or env vars, or any other eschewed feature.

What would you like to have added?

I would like to add the ability to specify query parameters when using a remote path in the configMapGenerator or the secretGenerator.

Why is this needed?

The configMapGenerator and secretGenerator both support specifying a remote path. This can be used to retrieve content before generating a configMap or secret.

For instance:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
namespace: example
configMapGenerator:
  - name: rds-ca
    files:
      - ca.pem=https://truststore.pki.rds.amazonaws.com/us-west-2/us-west-2-bundle.pem

Allows creating a configMap whose contents contain the pem-encoded certificate authority for AWS RDS. However, some endpoints support query parameters that can change the output format of requested content.

Can you accomplish the motivating task without this feature, and if so, how?

I could just download and apply the contents manually.

What other solutions have you considered?

N/A

Anything else we should know?

N/A

Feature ownership

• I am interested in contributing this feature myself! 🎉

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