properly define the backend helm chart

app/server/chart/backend/Chart.lock

+dependencies:
+- name: mongodb
+  repository: https://charts.bitnami.com/bitnami
+  version: 10.10.2
+digest: sha256:f1c853224061e8a0fc7fdbfa341318ae2a380b928c4650397b3dfb72ccfbe88f
+generated: "2021-03-14T16:35:10.24238+01:00"

app/server/chart/backend/Chart.yaml

 apiVersion: v2
 name: backend
-description: A Helm chart for Kubernetes
-
-# A chart can be either an 'application' or a 'library' chart.
-#
-# Application charts are a collection of templates that can be packaged into versioned archives
-# to be deployed.
-#
-# Library charts provide useful utilities or functions for the chart developer. They're included as
-# a dependency of application charts to inject those utilities and functions into the rendering
-# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+description: The backend service consisting of a node js server coupled to mongodb
 type: application
 
-# This is the chart version. This version number should be incremented each time you make changes
-# to the chart and its templates, including the app version.
-# Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.1.0
+# This is the chart version. SemVer!
+version: '0.1.0'
+
+# This is the version number of the application being deployed. No neccessarily SemVer!
+appVersion: 'v0.0.1'
 
-# This is the version number of the application being deployed. This version number should be
-# incremented each time you make changes to the application. Versions are not expected to
-# follow Semantic Versioning. They should reflect the version the application is using.
-# It is recommended to use it with quotes.
-appVersion: "1.16.0"
+dependencies:
+  - name: mongodb
+    repository: https://charts.bitnami.com/bitnami
+    version: '10.10.2'

app/server/chart/backend/values.yaml

-# Default values for backend.
-# This is a YAML-formatted file.
-# Declare variables to be passed into your templates.
-
+# Backend value definitions:
 replicaCount: 1
 
 image:
-  repository: node #! change to container registry if possible
+  repository: backend #! change to container registry if possible
   pullPolicy: IfNotPresent
   # Overrides the image tag whose default is the chart appVersion.
-  tag: ""
+  tag: "v0.0.1"
 
 imagePullSecrets: []
 nameOverride: ""
@@ -77,3 +74,18 @@ nodeSelector: {}
 tolerations: []
 
 affinity: {}
+
+# Depedencies definition
+mongodb:
+  fullnameOverride: 'mongodb'
+  image:
+    registry: 'docker.io'
+    repository: 'bitnami/mongodb'
+    tag: '10.10.2'
+  service:
+    port: 3002
+  # auth:
+  #   rootPassword: mongodb
+  # persistence:
+  #   enabled: true
+  #   existingClaim: 'pvc-db'