Add helm chart for init-agent

charts/init-agent/Chart.yaml

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+apiVersion: v2
+name: init-agent
+description: A Kubernetes agent to initialize newly created workspaces with Kubernetes objects.
+
+# version information
+version: 0.1.0
+appVersion: "v0.1.0"
+
+# optional metadata
+type: application
+home: https://www.kcp.io/
+keywords:
+  - kcp
+  - kubernetes
+  - multitenancy
+  - controlplane
+sources:
+  - https://github.com/kcp-dev/helm-charts
+  - https://github.com/kcp-dev/init-agent
+icon: https://raw.githubusercontent.com/kcp-dev/kcp/main/contrib/logo/blue-green.svg

charts/init-agent/LICENSE

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charts/init-agent/README.md

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+# kcp Helm Chart - Init Agent
+
+This Helm chart deploys an instance of the [Init Agent](https://github.com/kcp-dev/init-agent).
+
+## Mode of Operation
+
+The Init Agent connects to a variety of workspaces inside kcp. In each of them, the necessary
+RBAC needs to be provisioned for the agent to do its work.
+
+To accomplish this, this Helm chart can be configured to output three different sets of manifests,
+called **targets**:
+
+* `""` (default) – By default, the Helm chart will output the Deployment, ServiceAccount and RBAC to
+  run the Init Agent on a Kubernetes cluster. For this to work, you need to provide Helm with a
+  kubeconfig for that cluster.
+* `configcluster` – In this mode, the Helm chart outputs the RBAC necessary for the agent to read
+  and process its `InitTarget` objects. This is meant to be installed into the workspace that is
+  configured via `.configWorkspace` when installing the chart in default mode (above). This needs
+  to be done once, using a kubeconfig for Helm that points to the config workspace of choice in
+  kcp.
+* `wstcluster` – This mode outputs the necessary RBAC to read and initialize `WorkspaceTypes`. This
+  needs to be installed into each workspace where `WorkspaceType` objects exist that are referenced
+  by an `InitTarget`.For this to work, you need to provide Helm with a kubeconfig that points to
+  the effective workspace.
+
+To toggle between these, use the Helm variable `target`:
+
+```bash
+helm install init-agent kcp/init-agent \
+  --set "target=configcluster" \
+  --values myvalues.yaml
+```
+
+## Usage
+
+[Helm](https://helm.sh) must be installed to use the charts. Please refer to Helm's
+[documentation](https://helm.sh/docs) to get started.
+
+Once Helm has been set up correctly, add the repo as follows:
+
+```shell
+helm repo add kcp https://kcp-dev.github.io/helm-charts
+```
+
+If you had already added this repo earlier, run `helm repo update` to retrieve the latest versions
+of the packages. You can then run `helm search repo kcp` to see the charts.
+
+To install the kcp chart:
+
+```shell
+helm upgrade --install my-init-agent kcp/init-agent --values ./myvalues.yaml
+```
+
+**NB:** Remember to install the chart also into kcp. See [mode of operation](#mode-of-operation) above.
+
+To uninstall the release:
+
+```shell
+helm delete my-init-agent
+```
+
+## Configuration
+
+### kcp kubeconfig
+
+When installing the Init Agent, you need to provide it with the name of a Kubernetes Secret that
+contains a kubeconfig to communicate with kcp (using the `kcpKubeconfig` variable of this chart).
+
+Since the concrete way you choose to authenticate to kcp is up to you (the [kcp-operator](https://docs.kcp.io/kcp-operator/) for example relies on client certificates), and the Helm chart can configure RBAC,
+you need to configure in the Helm chart as what user the Init Agent is authenticated in kcp. The
+default configuration assumes that the user is named `kcp-init-agent`:
+
+```yaml
+configCluster:
+  rbacSubject:
+    kind: User
+    name: my-init-agent
+```

charts/init-agent/templates/_helpers.tpl

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+{{- define "name" -}}{{ .Release.Name }}{{- end }}
+{{- define "agentname" -}}{{ .Values.agentName | default .Release.Name }}{{- end }}
+
+{{- define "imagePullSecrets" -}}
+{{- range .Values.imagePullSecrets }}
+{{- if eq (typeOf .) "map[string]interface {}" }}
+- {{ toYaml . | trim }}
+{{- else }}
+- name: {{ . }}
+{{- end }}
+{{- end }}
+{{- end -}}