[Bug]: deploymentRegistry.namespace None cause error in kubernetes provider

[phangiabao98]

Bug

deploymentRegistry.namespace None cause error in kubernetes provider

My build action

kind: Build
name: api
type: container
description: Build the vote API
allowPublish: False

Current behavior

### none workable project.garden.yml
providers:
  - name: kubernetes
    environments: [remote]
    context: "ink-k8s"
    ingressClass: "nginx"
    buildMode: cluster-buildkit
    imagePullSecrets:
      - name: "gitlab-container-registry"
        namespace: default
    deploymentRegistry:
      hostname: "gitlab.inter-k.com:5050/inter-k/internal-software/rnd/kguru"
      # namespace: ${var.userNamespace}
    namespace: ${var.userNamespace}
    defaultHostname: ${var.baseHostname}

workable project.garden.yml

providers:
  - name: kubernetes
    environments: [remote]
    context: "ink-k8s"
    ingressClass: "nginx"
    buildMode: cluster-buildkit
    imagePullSecrets:
      - name: "gitlab-container-registry"
        namespace: default
    deploymentRegistry:
      hostname: "gitlab.inter-k.com:5050/inter-k/internal-software/rnd/kguru"
      namespace: ${var.userNamespace}
    namespace: ${var.userNamespace}
    defaultHostname: ${var.baseHostname}

Error happend when i run garden build api

Expected behavior

Because providers[].deploymentRegistry.namespace is optional so expect that Build action still work even I don't define namespace value.

The error is about parsing image with invalid _ character inside

This error cause me plenty of time to trace and debug so hope that I can create a PR to help other spending less time on this issue.

[phangiabao98]

created MR https://github.com/garden-io/garden/pull/6636

[twelvemo]

Hello @phangiabao98 , thank you very much for reporting and contributing to garden. I looked at your PR but there are a couple of additional places that need to be changed for this to work. I created another PR in #6638