fix: add nil-safety guards for global imagePullSecrets

Guard against nil values when .Values.global or
.Values.global.imagePullSecrets is undefined by checking
.Values.global exists before accessing its keys and using
default empty lists in concat to prevent template errors
when used as a subchart.

Author: tazarov

charts/chromadb-chart/templates/statefulset.yaml

@@ -27,9 +27,9 @@ spec:
     spec:
       securityContext: {{ toYaml .Values.podSpec.securityContext | nindent 8 }}
       terminationGracePeriodSeconds: {{ .Values.podSpec.terminationGracePeriodSeconds }}
-      {{- if or .Values.imagePullSecrets .Values.global.imagePullSecrets }}
+      {{- if or .Values.imagePullSecrets (and .Values.global .Values.global.imagePullSecrets) }}
       imagePullSecrets:
-        {{- toYaml (concat .Values.global.imagePullSecrets .Values.imagePullSecrets) | nindent 8 }}
+        {{- toYaml (concat (default list .Values.global.imagePullSecrets) (default list .Values.imagePullSecrets)) | nindent 8 }}
       {{- end }}
       {{- with .Values.nodeSelector }}
       nodeSelector: