feat: Ability to specify existing secret as database url (#751)

Closes #750

charts/planka/templates/deployment.yaml

@@ -64,8 +64,16 @@ spec:
             {{- toYaml .Values.resources | nindent 12 }}
           env:
           {{- if not .Values.postgresql.enabled }}
+          {{- if .Values.existingDburlSecret }}
             - name: DATABASE_URL
-              value: {{ required "If the included postgresql deployment is disabled you need to define a Database URL in 'dburl'" .Values.dburl }}
+              valueFrom:
+                secretKeyRef:
+                  name: .Values.existingDburlSecret
+                  key: uri
+          {{- else }}
+            - name: DATABASE_URL
+              value: {{ required "If the included postgresql deployment is disabled you need to provide an existing secret in .Values.existingDburlSecret or define a Database URL in 'dburl'" .Values.dburl }}
+          {{- end }}
           {{- else }}
             - name: DATABASE_URL
               valueFrom:

charts/planka/values.yaml

@@ -105,9 +105,15 @@ postgresql:
   serviceBindings:
     enabled: true
 
-## Set this if you disable the built-in postgresql deployment
+## Set this or existingDburlSecret if you disable the built-in postgresql deployment
 dburl:
 
+## @param existingDburlSecret Name of an existing secret containing a DBurl connection string
+## NOTE: Must contain key `uri`
+## NOTE: When it's set, the `dburl` parameter is ignored
+##
+existingDburlSecret: ""
+
 ## PVC-based data storage configuration
 persistence:
   enabled: false