THREESCALE-8749: Ability to set APICAST_SERVICE_CACHE_SIZE

[sergioifg94]

Description

Add optional fields in the Apicast production and staging sections of the APIManager CRD that sets the APICAST_SERVICE_CACHE_SIZE environment variable in the Apicast containers

Verification steps

On a cluster, run the operator and create an APIManager with the new fields set. Check that once reconciled the DeploymentConfigs include the environment variable with the value from the new fields:

1. Apply the manifests

   make install

2. Run the operator

   make run

3. Create an APIManager that includes the following in the spec:

   apicast:
     productionSpec:
       serviceCacheSize: 20
     stagingSpec:
       serviceCacheSize: 10

4. Check the DeploymentConfigs for APICast

   oc get dc/apicast-staging -o yaml
   oc get dc/apicast-production -o yaml

5. Verify that they include the environment variable

   # apicast-staging
   - name: APICAST_SERVICE_CACHE_SIZE
      value: '10'
   
   # apicast-production
   - name: APICAST_SERVICE_CACHE_SIZE
      value: '20'

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