Add configurable nodeSelector to substrate workloads

Add a global `nodeSelector` value plus per-component overrides
(ateApiServer, ateController, atenetRouter, dns, rustfs, atelet) so the
substrate workloads can be pinned to specific nodes.

Each component resolves its effective nodeSelector as
`or .Values.<component>.nodeSelector .Values.nodeSelector`, so a
non-empty component-level map wins and otherwise the global default
applies. All defaults are empty, so rendered output is unchanged
(render-manifests --check passes).

valkey is intentionally excluded.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: the-mentor

charts/substrate/templates/ate-api-server.yaml

@@ -69,6 +69,10 @@ spec:
         prometheus.io/port: "9090"
     spec:
       serviceAccountName: {{ include "substrate.fullname" (list "ate-api-server" .) }}
+      {{- with (or .Values.ateApiServer.nodeSelector .Values.nodeSelector) }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
 {{- if eq .Values.auth.mode "jwt" }}
       initContainers:
       - name: assemble-cred-bundle

charts/substrate/templates/ate-controller.yaml

@@ -67,6 +67,10 @@ spec:
         app: ate-controller
     spec:
       serviceAccountName: {{ include "substrate.fullname" (list "ate-controller" .) }}
+      {{- with (or .Values.ateController.nodeSelector .Values.nodeSelector) }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       containers:
       - name: ate-controller
         image: {{ include "substrate.componentImage" (list "atecontroller" .) }}

charts/substrate/templates/atelet.yaml

@@ -63,6 +63,10 @@ spec:
         prometheus.io/port: "9090"
     spec:
       serviceAccountName: {{ include "substrate.fullname" (list "atelet" .) }}
+      {{- with (or .Values.atelet.nodeSelector .Values.nodeSelector) }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       containers:
       - name: atelet
         image: {{ include "substrate.componentImage" (list "atelet" .) }}

charts/substrate/templates/atenet-dns.yaml

@@ -92,6 +92,10 @@ spec:
         app: dns
     spec:
       serviceAccountName: {{ include "substrate.fullname" (list "atenet-dns" .) }}
+      {{- with (or .Values.dns.nodeSelector .Values.nodeSelector) }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       shareProcessNamespace: true
       initContainers:
       - name: init-dns

charts/substrate/templates/atenet-router.yaml

@@ -136,6 +136,10 @@ spec:
         prometheus.io/port: "9090"
     spec:
       serviceAccountName: {{ include "substrate.fullname" (list "atenet-router" .) }}
+      {{- with (or .Values.atenetRouter.nodeSelector .Values.nodeSelector) }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       containers:
       - name: atenet-router
         image: {{ include "substrate.componentImage" (list "atenet" .) }}

charts/substrate/templates/rustfs.yaml

@@ -59,6 +59,10 @@ spec:
       labels:
         app: rustfs
     spec:
+      {{- with (or .Values.rustfs.nodeSelector .Values.nodeSelector) }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       securityContext:
         runAsUser: 10001
         runAsGroup: 10001

charts/substrate/values.yaml

@@ -71,6 +71,12 @@ auth:
 # manifests/ate-install/ install path (kubectl apply).
 createNamespace: false
 
+# Global nodeSelector applied to the substrate workloads (ate-api-server,
+# ate-controller, atenet-router, dns, rustfs, and the atelet DaemonSet). Each
+# of those components also exposes its own `nodeSelector`; when set to a
+# non-empty map it overrides this global default for that component.
+nodeSelector: {}
+
 valkey:
   enabled: true
   replicas: 6
@@ -82,6 +88,8 @@ rustfs:
   bucket: ate-snapshots
   accessKey: rustfsadmin
   secretKey: rustfsadmin
+  # Overrides the global .Values.nodeSelector for the rustfs deployment.
+  nodeSelector: {}
 
 # atelet daemonset overrides. Defaults use the in-cluster RustFS deployment for
 # snapshots. Set rustfs.enabled=false and override these fields when using
@@ -93,6 +101,23 @@ atelet:
   storageBackend: s3
   extraArgs: []
   extraEnv: []
+  # Overrides the global .Values.nodeSelector for the atelet DaemonSet.
+  nodeSelector: {}
+
+# Per-component overrides for the control-plane deployments. Each nodeSelector,
+# when set to a non-empty map, overrides the global .Values.nodeSelector for
+# that component only.
+ateApiServer:
+  nodeSelector: {}
+
+ateController:
+  nodeSelector: {}
+
+atenetRouter:
+  nodeSelector: {}
+
+dns:
+  nodeSelector: {}
 
 redis:
   # Override the cluster address. Empty -> derived from valkey.enabled