[API server] add extraInitContainers field to helm deployment (skypilot-org#5918)

extra init containers

Author: SeungjinYang

charts/skypilot/templates/api-deployment.yaml

@@ -323,6 +323,10 @@ spec:
         - name: lambda-config
           mountPath: /root/.lambda_cloud
       {{- end }}
+      {{- if .Values.extraInitContainers }}
+      {{- toYaml .Values.extraInitContainers | nindent 6 }}
+      {{- end }}
+
       volumes:
       {{- if .Values.storage.enabled }}
       - name: state-volume

charts/skypilot/values.yaml

@@ -281,6 +281,9 @@ nebiusCredentials:
   # Name of the secret containing the Nebius credentials. Only used if enabled is true.
   nebiusSecretName: nebius-credentials
 
+# Extra init containers to run before the api container
+extraInitContainers:
+
 # Set securityContext for the api pod
 podSecurityContext: {}