feat: make swagger-ui image configurable (#4089)

This allows to customize swagger in the same way
as other components. Useful for example when
deploying on OpenShift where the default image
cannot run due to security constraints.

Author: sgaist

helm-chart/renku/templates/swagger.yaml

@@ -19,7 +19,7 @@ spec:
     spec:
       containers:
         - name: swagger
-          image: swaggerapi/swagger-ui
+          image: "{{ .Values.swagger.image.repository }}:{{ .Values.swagger.image.tag }}"
           env:
             - name: BASE_URL
               value: /swagger

helm-chart/renku/values.yaml

@@ -1449,6 +1449,9 @@ core:
 ## Configuration for the Swagger-UI available at <renku-domain>/swagger
 swagger:
   enabled: true
+  image:
+    repository: swaggerapi/swagger-ui
+    tag: "latest"
 ## The image used in startup scripts to initialize different postgress databases
 initDb:
   image: