Add helper for local dev workflow

[modulo11]

Tool to simplify the workflow for local development. The script asks for the release and project the developer is working on. It also manipulates the default values.yaml of the respective release to point to the locally build image. This is not too nice, but the (I think) most convenient way for a developer. If we're happy with the current state, I'd also update the development guide to use this and build a docker image for simple usage.

Example for routing/gorouter:

❯ python scripts/dev.py
? Which release are you working on? routing
? Which project are you working on? gorouter
Here are some instructions to build a local image and load it into the cluster. Make sure to replace <path-to-release> with the actual path to the release you are working on.
Docker will ask for confirmation to access the local file system, please allow it to do so.

docker buildx bake gorouter --set gorouter.contexts.src=<path-to-routing-release>/src
kind load docker-image gorouter:latest --name cfk8s
make up

--- a/releases/routing/helm/values.yaml
+++ b/releases/routing/helm/values.yaml
@@ -7,8 +7,8 @@ gorouter:
   isolationSegments: []
   routingTableShardingMode: all
   image:
-    repository: ghcr.io/cloudfoundry/k8s/gorouter
-    tag: ""
+    repository: gorouter
+    tag: "latest"
     imagePullPolicy: IfNotPresent
   nodeSelector: ~
   tolerations: ~

[c0d1ngm0nk3y]

Should we align it with the docs/local-development-guide? There, we do not use make up, but change it in the cluster.

[modulo11]

Yes of course. I just wanted to get feedback on the idea and approach before touching too many parts.