helm: Output database-specific connection command

When the helm chart finishes installing, it prints out instructions for
connecting to the newly created deployment. Previously, these
instructions were only provided for mysql, and they were provided
regardless of the database type.

This commit looks at adapter.type and prints out the appropriate mysql
or psql command accordingly.

Refs: REA-2744
Change-Id: Iad41b5cfb9271b9c1eb906cdefa878a2849e09a6
Reviewed-on: https://gerrit.readyset.name/c/readyset/+/5533
Tested-by: Buildkite CI
Reviewed-by: Jason Camp <jason@readyset.io>

helm/readyset/templates/NOTES.txt

@@ -6,9 +6,22 @@ APP VERSION: {{ .Chart.AppVersion }}
 
 Give the chart approximately 5 minutes to deploy. When the service is ready, you should see all pods up.
 
+{{- if eq .Values.readyset.adapter.type "mysql" }}
 For connecting to MySQL:
 
-mysql -u $(kubectl get secret readyset-upstream-database -o jsonpath="{.data.username}" | base64 -d) \
+mysql \
+  -u $(kubectl get secret readyset-upstream-database -o jsonpath="{.data.username}" | base64 -d) \
   -h $(kubectl get svc readyset-adapter --template {{ "\"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}\"" }}) \
   --password=$(kubectl get secret readyset-upstream-database -o jsonpath="{.data.password}" | base64 -d) \
   --database=$(kubectl get secret readyset-upstream-database -o jsonpath="{.data.database}" | base64 -d)
+
+{{- else if eq .Values.readyset.adapter.type "postgresql" }}
+For connecting to PostgreSQL:
+
+PGPASS=$(kubectl get secret readyset-upstream-database -o jsonpath="{.data.password}" | base64 -d) \
+psql \
+  -U $(kubectl get secret readyset-upstream-database -o jsonpath="{.data.username}" | base64 -d) \
+  -h $(kubectl get svc readyset-adapter --template {{ "\"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}\"" }}) \
+  --dbname=$(kubectl get secret readyset-upstream-database -o jsonpath="{.data.database}" | base64 -d)
+
+{{- end }}