chore: remove unused pgsql configuration from Helm chart values (#364)

### Summary
This PR removes the commented `pgsql` configuration block from the Helm chart `values.yaml`.

### Motivation
The chart currently exposes commented PostgreSQL configuration that appears to suggest PostgreSQL is supported, but:

- The chart only implements MySQL configuration paths.
- The `pgsql` values are not wired into templates.
- Setting `option.database=pgsql` does not produce a working deployment.

This creates confusion for users and leads to time spent attempting to configure an unsupported path.

### Change
- Removes the commented `pgsql` configuration block from values.yaml.
- Leaves MySQL as the clearly supported database option.

### Benefit
- Reduces ambiguity around supported database backends.
- Prevents users from attempting a non-functional configuration.
- Improves chart clarity and maintainability.

If/when PostgreSQL support becomes fully implemented, the configuration can be reintroduced with complete wiring and documentation.

Happy to help reintroduce when full support exists.

Author: jeremiahbowen

charts/devlake/templates/secrets.yaml

@@ -24,8 +24,6 @@ stringData:
 {{- if (eq .Values.option.database "mysql") }}
   MYSQL_PASSWORD: "{{ .Values.mysql.password }}"
   MYSQL_ROOT_PASSWORD: "{{ .Values.mysql.rootPassword }}"
-#{{- else if (eq .Values.option.database "pgsql")}}
-#  POSTGRES_PASSWORD: "{{ .Values.pgsql.password }}"
 {{- end }}
 {{- end }}
 

charts/devlake/values.yaml

@@ -127,57 +127,6 @@ mysql:
     loadBalancerIP: ""
     extraLabels: {}
 
-# pgsql:
-#   # if use external pgsql server, please set true
-#   #   by default using false, chart will create a single pgsql instance
-#   useExternal: false
-
-#   # the external pgsql server address
-#   externalServer: 127.0.0.1
-
-#   # external pgsql port
-#   externalPort: 5432
-#   # the username for devlake database
-#   username: merico
-
-#   # the password for devlake database
-#   password: merico
-
-#   # the database for devlake
-#   database: lake
-
-#   # storage for pgsql
-#   storage:
-#     # the storage class for pv, leave empty will using default
-#     class: ""
-#     size: 5Gi
-
-#   # image for pgsql
-#   image:
-#     repository: postgres
-#     tag: 14.5
-#     pullPolicy: IfNotPresent
-
-#   # resources config for pgsql if have
-#   resources: {}
-
-#   # nodeSelector config for pgsql if have
-#   nodeSelector: {}
-
-#   # tolerations config for pgsql if have
-#   tolerations: []
-
-#   # affinity config for pgsql if have
-#   affinity: {}
-
-#   extraLabels: {}
-
-#   securityContext: {}
-
-#   containerSecurityContext: {}
-
-#   annotations: {}
-
 # dependency chart values
 grafana:
   enabled: true