chore: add docs on how to use the registryCredentialsSecret option

Add documentation on how to use the `registryCredentialsSecret` to
enable wasmCloud hosts to pull from a private registry.

Also add comments to each of the CRD fields outlining what each field
does.

Signed-off-by: Dan Norris <protochron@users.noreply.github.com>

README.md

@@ -28,11 +28,14 @@ spec:
   hostLabels:
     some-label: value
   # Which wasmCloud version to use
-  version: 0.81.0
+  version: 0.82.0
   # The name of a secret in the same namespace that provides the required secrets.
   secretName: cluster-secrets
   # Enable the following to run the wasmCloud hosts as a DaemonSet
   #daemonset: true
+  # The name of the image pull secret to use with wasmCloud hosts so that they
+  # can authenticate to a private registry to pull components.
+  # registryCredentialsSecret: my-registry-secret
 ```
 
 The CRD requires a Kubernetes Secret with the following keys:
@@ -48,13 +51,23 @@ data:
   WASMCLOUD_CLUSTER_SEED: <seed>
   # Only required if using a NATS creds file
   # nats.creds: <base64 encoded creds file>
-  # Only required if using OCI private registry
-  # OCI_REGISTRY_PASSWORD: <password>
 ```
 
 The operator will fail to provision the wasmCloud Deployment if any of these
 secrets are missing!
 
+### Image Pull Secrets
+
+You can also specify an image pull secret to use use with the wasmCloud hosts
+so that they can pull components from a private registry. This secret needs to
+be in the same namespace as the WasmCloudHostConfig CRD and must be a
+`kubernetes.io/dockerconfigjson` type secret. See the [Kubernetes
+documentation](https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/#registry-secret-existing-credentials)
+for more information on how to provision that secret.
+
+Once it is created, you can reference it in the WasmCloudHostConfig CRD by
+setting the `registryCredentialsSecret` field to the name of the secret.
+
 ## Deploying the operator
 
 A wasmCloud cluster requires a few things to run:

crates/types/src/v1alpha1/wasmcloud_host_config.rs

@@ -10,34 +10,54 @@ use std::collections::HashMap;
     kind = "WasmCloudHostConfig",
     group = "k8s.wasmcloud.dev",
     version = "v1alpha1",
-    shortname = "chc",
+    shortname = "whc",
     namespaced,
     status = "WasmCloudHostConfigStatus",
     printcolumn = r#"{"name":"App Count", "type":"integer", "jsonPath":".status.app_count"}"#
 )]
 #[serde(rename_all = "camelCase")]
 pub struct WasmCloudHostConfigSpec {
+    /// The number of replicas to use for the wasmCloud host Deployment.
     #[serde(default = "default_host_replicas")]
     pub host_replicas: u32,
+    /// A list of cluster issuers to use when provisioning hosts. See
+    /// https://wasmcloud.com/docs/deployment/security/zero-trust-invocations for more information.
     pub issuers: Vec<String>,
+    /// The lattice to use for these hosts.
     pub lattice: String,
+    /// An optional set of labels to apply to these hosts.
     pub host_labels: Option<HashMap<String, String>>,
+    /// The version of the wasmCloud host to deploy.
     pub version: String,
+    /// The name of a secret containing the primary cluster issuer key along with an optional set
+    /// of NATS credentials.
     pub secret_name: String,
+    /// Enable structured logging for host logs.
     pub enable_structured_logging: Option<bool>,
+    /// Name of a secret containing the registry credentials
     pub registry_credentials_secret: Option<String>,
+    /// Kubernetes resources to allocate for the host. See
+    /// https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ for valid
+    /// values to use here.
     pub resources: Option<WasmCloudHostConfigResources>,
+    /// The control topic prefix to use for the host.
     pub control_topic_prefix: Option<String>,
+    /// The leaf node domain to use for the NATS sidecar. Defaults to "leaf".
     #[serde(default = "default_leaf_node_domain")]
     pub leaf_node_domain: String,
+    /// Enable the config service for this host.
     #[serde(default)]
     pub config_service_enabled: bool,
+    /// The address of the NATS server to connect to. Defaults to "nats://nats.default.svc.cluster.local".
     #[serde(default = "default_nats_address")]
     pub nats_address: String,
+    /// The Jetstream domain to use for the NATS sidecar. Defaults to "default".
     #[serde(default = "default_jetstream_domain")]
     pub jetstream_domain: String,
+    /// The log level to use for the host. Defaults to "INFO".
     #[serde(default = "default_log_level")]
     pub log_level: String,
+    /// Run hosts as a DaemonSet instead of a Deployment.
     #[serde(default)]
     pub daemonset: bool,
 }

sample.yaml

@@ -13,7 +13,7 @@ spec:
   hostLabels:
     test: value
   # Which wasmCloud version to use
-  version: 0.81.0
+  version: 0.82.0
   # The name of a secret in the same namespace that provides the required secrets.
   secretName: cluster-secrets
   logLevel: INFO