fix: add /api ingress path routing to backend

chart/templates/ingress.yaml

@@ -19,6 +19,13 @@ spec:
     - host: {{ .Values.ingress.host }}
       http:
         paths:
+          - path: /api
+            pathType: Prefix
+            backend:
+              service:
+                name: {{ .Release.Name }}-backend
+                port:
+                  number: {{ .Values.backend.port }}
           - path: /
             pathType: Prefix
             backend: