Add resources templating option to kaap operator deployment

[MarkusNeuron]

For our cluster operation and complying to security standards its mandatory being able to configure pod resources.

Some standards for resources configuration we need to comply:

• OWASP API Security Top 10-API7:2019-Security Misconfiguration
• CWE Top 25 Most Dangerous Software Weaknesses-cwe-top-25
• OWASP Docker Top 10 2018-D07 - Resource Protection
• CIS Docker - Level 1-5.10

Because we should be flexible to applying different patterns for resource-requests and -limits I templated the full resources: block depending on values configuration and not the individual values.
E.g. one example pattern for requests and limits

[MarkusNeuron]

Any update on this one?

[nicoloboschi]

Thanks @MarkusNeuron
I'll cut a release once CI passes and this is merged

[nicoloboschi]

@MarkusNeuron can you please fix the CI?

I think you have to add the new values property here:

kaap/tests/src/test/java/com/datastax/oss/kaap/tests/BaseK8sEnvTest.java

Line 215 in daaf6fc

vars.put(".Release.Namespace", namespace);

[MarkusNeuron]

Added var to test. Hope this fixes CI.

[MarkusNeuron]

Test failed again. It seems that the test library can not work with templating functions. I will change test test to an empty resources key. I hope to fix the testcase issue this way.

[MarkusNeuron]

Sorry guys I do not know how to fix this in test. When I template with:

operator:
  enabled: true
  image: datastax/kaap:0.2.0
  imagePullPolicy: IfNotPresent
  replicas: 1
  resources: {}
  livenessProbe:
    failureThreshold: 3
...

of without resource key at all I get the correct output without resource config.

Templating with values:

operator:
  enabled: true
  image: datastax/kaap:0.2.0
  imagePullPolicy: IfNotPresent
  replicas: 1
  resources:
    requests:
      cpu: "0.2"
      memory: "512Mi"
    limits:
      memory: "512Mi"  
  livenessProbe:
    failureThreshold: 3

leads also to the correct template:

...
    spec:
      containers:
        - env:
            - name: KUBERNETES_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          envFrom:
            - configMapRef:
                name: kaap
          image: datastax/kaap:0.2.0
          imagePullPolicy: IfNotPresent
          resources:
            limits:
              memory: 512Mi
            requests:
              cpu: "0.2"
              memory: 512Mi
          livenessProbe:
            failureThreshold: 3
...

So how we can fix the java for ci testing?
Thx, Markus