feat(helm): add startup probe support to deployment template

Add a configurable startupProbe to the Helm chart, following the same
pattern as the existing readinessProbe and livenessProbe.

The startup probe is disabled by default to avoid breaking existing
deployments. When enabled, it uses the /health endpoint on the
management port with a failureThreshold of 30 and periodSeconds of 10,
allowing up to ~5 minutes for the application to start.

Author: TwoStone

helm/akhq/templates/deployment.yaml

@@ -115,6 +115,18 @@ spec:
             successThreshold: {{ $.Values.readinessProbe.successThreshold }}
             failureThreshold: {{ $.Values.readinessProbe.failureThreshold }}
           {{- end }}
+          {{- if $.Values.startupProbe.enabled }}
+          startupProbe:
+            httpGet:
+              path: {{ .Values.startupProbe.prefix | default "" }}{{ $.Values.startupProbe.path }}
+              port: {{ $.Values.startupProbe.port }}
+              {{- if $.Values.startupProbe.httpGetExtra }}{{ toYaml $.Values.startupProbe.httpGetExtra | trim | nindent 14 }}{{ end }}
+            initialDelaySeconds: {{ $.Values.startupProbe.initialDelaySeconds }}
+            periodSeconds: {{ $.Values.startupProbe.periodSeconds }}
+            timeoutSeconds: {{ $.Values.startupProbe.timeoutSeconds }}
+            successThreshold: {{ $.Values.startupProbe.successThreshold }}
+            failureThreshold: {{ $.Values.startupProbe.failureThreshold }}
+          {{- end }}
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
       {{- with .Values.nodeSelector }}

helm/akhq/values.yaml

@@ -179,6 +179,18 @@ livenessProbe:
   failureThreshold: 3
   httpGetExtra: {}
 
+startupProbe:
+  enabled: false
+  prefix: "" # set same as `micronaut.server.context-path`
+  path: /health
+  port: management
+  initialDelaySeconds: 0
+  periodSeconds: 10
+  timeoutSeconds: 5
+  successThreshold: 1
+  failureThreshold: 30
+  httpGetExtra: {}
+
 resources: {}
   # limits:
   #  cpu: 100m