chore: align REF_CONFIGURATION between API and workers

- Set REF_CONFIGURATION=/ref for both API and worker defaults
- Add REF_SOFTWARE_ROOT=/ref/software to worker defaults
- Remove REF_DATABASE_URL from API defaults (read from ref.toml)
- Deployments can use volume subPath mounts to select different
  config directories without overriding REF_CONFIGURATION

Author: lewisjared

helm/local-test-values.yaml

@@ -59,7 +59,7 @@ api:
     ENVIRONMENT: local
     SECRET_KEY: local-test-secret
     REF_DATABASE_URL: sqlite:////tmp/ref.db
-    REF_CONFIGURATION: /app/.ref
+    REF_CONFIGURATION: /ref
   volumes:
   - name: tmp
     emptyDir: {}

helm/values.yaml

@@ -15,8 +15,7 @@ api:
     ENVIRONMENT: production
     LOG_LEVEL: INFO
     SECRET_KEY: changethis          # Must override in production
-    REF_DATABASE_URL: ""            # Required: e.g. postgresql://user:pass@host:5432/db or sqlite:////path/to/db
-    REF_CONFIGURATION: /app/.ref
+    REF_CONFIGURATION: /ref
 
   ingress:
     enabled: false
@@ -148,6 +147,8 @@ defaults:
     CELERY_ACCEPT_CONTENT: |
       ["json", "pickle"]
     REF_EXECUTOR: climate_ref_celery.executor.CeleryExecutor
+    REF_CONFIGURATION: /ref
+    REF_SOFTWARE_ROOT: /ref/software
     # Set HOME to writable location to fix intake-esgf and ilamb3 config directory creation
     HOME: /tmp
     # Celery reliability tuning (uncomment to override base.py defaults)