[charts/metabase] Add possibility to extend the cloud proxy command arguments

[redpanda]

Hi there 👋

Description

Currently, the metabase chart does not expose configuration options to customize the Cloud SQL proxy container's command arguments.

Use Case

We would like to add this flag:ip_address_types=PRIVATE to use the database private IP.

Proposed Solution

1. Add a values configuration option (e.g., googleCloudSQL.sidecarCommandArgsExtra) to extend the proxy command arguments.
2. Define the value database.googleCloudSQL.ipAddressTypes set to ""

Implementation 1

values.yaml

database:
  googleCloudSQL:
    sidecarCommandArgsExtra:
      - "-ip_address_types=PRIVATE"

deployment.yaml

- name: cloudsql-proxy
  #...
  command:
    - "/cloud_sql_proxy"
    - "-instances={{ join "," .Values.database.googleCloudSQL.instanceConnectionNames }}"
    - "-term_timeout=10s"
    - "-structured_logs"
    - "-use_http_health_check"
    - "-enable_iam_login"
    {{ toYaml .Values.googleCloudSQL.sidecarCommandArgsExtra | nindent 4 }}

Implementation 2

values.yaml

database:
  googleCloudSQL:
    ipAddressTypes: ""

deployment.yaml

- name: cloudsql-proxy
  #...
  command:
    - "/cloud_sql_proxy"
    - "-instances={{ join "," .Values.database.googleCloudSQL.instanceConnectionNames }}"
    - "-term_timeout=10s"
    - "-structured_logs"
    - "-use_http_health_check"
    - "-enable_iam_login"
    {{- if .Values.database.googleCloudSQL.ipAddressTypes }}
    - "-ip_address_types={{ .Values.database.googleCloudSQL.ipAddressTypes }}"
    {{- end }}

I suggest doing implementation 2. I can do it.