Allow adding extra settings files from configmaps or secrets

[kurokobo]

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Feature Summary

Summary

If the users want to add extra settings to AWX, currently users can define them in extra_settings in AWX CR or mount any settings files under /etc/tower/conf.d/,

However, extra_settings is difficult to pass dictionaries or lists formatted for readability. In addition, if there is a large number of keys in extra_settings, it is difficult to manage.
These problems can be solved by mounting additional settings files, but it is still a bit of a hassle because we have to write exactly multiple volumes in a multi-line string in multiple places e.g. extra_volumes, web_extra_volume_mounts, task_extra_volume_mounts.

Therefore, I propose the addition of extra_settings_files to CRD to provide the ability to easily mount any configmap or secrets as additional settings files.

It would be better to support mounting secrets containing the entire settings file, not just the configmaps, in case users want to embed sensitive information directly in the settings file.

Example configmaps and secrets:

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: awx-extra-settings-auth-configmap
  ...
data:
  saml.py: |
    HOGE = "hoge"
    FUGA = "fuga"
  ldap.py: |
    PIYO = "piyo"
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: awx-extra-settings-jobs-configmp
  ...
data:
  job.py: |
    import os
    FOO = [
      "hoge",
      "fuga",
      "piyo",
    ]
    BAR = {
      "hoge": "hoge",
      "fuga": "fuga",
      "piyo": "piyo",
    }
    BAZ = os.getenv("BAZ")
---
apiVersion: v1
kind: Secret
metadata:
  name: awx-extra-settings-passwords-secrets
  ...
stringData:
  passwords.py: |
    HOGE_PASSWORD="my-super-secure-passwords"
    FUGA_PASSWORD="my-super-secure-passwords"

Example AWX CR

---
apiVersion: awx.ansible.com/v1beta1
kind: AWX
metadata:
  name: awx
  ...
spec
  ...
  extra_settings_files:
    configmaps:
      - name: awx-extra-settings-auth-configmap
        key: saml.py
      - name: awx-extra-settings-auth-configmap
        key: ldap.py
      - name: awx-extra-settings-jobs-configmp
        key: job.py
    secrets:
      - name: awx-extra-settings-passwords-secrets
        key: passwords.py
  ...

Additional info

Context: #1824 (comment)

[kurokobo]

@rooftopcellist
Please let me know if you have any ideas or opinions about this 😃