fix: make hmac optional

bitbucketcloud does not support hmac. make as optional

Author: dali546

charts/lighthouse-webui-plugin/templates/deployment.yaml

@@ -72,6 +72,7 @@ spec:
         - name: LIGHTHOUSE_HMAC_KEY
           valueFrom:
             secretKeyRef: {{- .Values.secrets.lighthouse.hmac.secretKeyRef | toYaml | nindent 14 }}
+            optional: true
         {{- range $pkey, $pval := .Values.pod.env }}
         - name: {{ $pkey }}
           value: {{ quote $pval }}