allow option to add valuesFrom env vars

[ashleyschuett]

What does this PR do?

Add the option to have valuesFrom env vars in the Janus deployment.

Example output:

# Source: janus/templates/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: imprecise-robin-janus
  labels:
    app.kubernetes.io/name: janus
    helm.sh/chart: janus-0.1.0
    app.kubernetes.io/instance: imprecise-robin
    app.kubernetes.io/version: "1.0"
    app.kubernetes.io/managed-by: Tiller
spec:
  replicas: 2
  selector:
    matchLabels:
      app.kubernetes.io/name: janus
      app.kubernetes.io/instance: imprecise-robin
  template:
    metadata:
      labels:
        app.kubernetes.io/name: janus
        app.kubernetes.io/instance: imprecise-robin
    spec:
      containers:
        - name: janus
          image: "quay.io/hellofresh/janus:latest"
          imagePullPolicy: Always
          ports:
            - name: http
              containerPort: 8080
              protocol: TCP
            - containerPort: 8081
              name: http-private
              protocol: TCP
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: "DATABASE_DSN"
              value: "mongodb://janus-database:27017/janus"

[vgarvardt]

👍

[codecov[bot]]

Codecov Report

Merging #424 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #424   +/-   ##
=======================================
  Coverage   40.46%   40.46%           
=======================================
  Files          76       76           
  Lines        2659     2659           
=======================================
  Hits         1076     1076           
  Misses       1520     1520           
  Partials       63       63

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[aleksandrzhiliaev]

+1