Configure memory resource requests on builder pods

[davsclaus]

If you have set a memory limit range on a namespace, such as

davsclaus:/workspace/camel-k/examples (master)/$ k describe LimitRange mem-limit-range
Name:       mem-limit-range
Namespace:  default
Type        Resource  Min  Max  Default Request  Default Limit  Max Limit/Request Ratio
----        --------  ---  ---  ---------------  -------------  -----------------------
Container   memory    -    -    25Mi             100Mi          -

And then for example run a kamel integration where a new build is needed, then the builder pod runs out of memory.

│Status:                                                                                                                                   │
│  Base Image:  fabric8/s2i-java:3.0-java8                                                                                                 │
│  Duration:    2.142086252s                                                                                                               │
│  Error:       failure while determining classpath: signal: killed                                                                        │
│  Failure:                                                                                                                                │
│    Reason:  failure while determining classpath: signal: killed                                                                          │
│    Recovery:                                                                                                                             │
│      Attempt:       5                                                                                                                    │
│      Attempt Max:   5                                                                                                                    │
│      Attempt Time:  2019-11-25T17:09:23Z                                                                                                 │
│    Time:            2019-11-25T17:07:06Z                                                                                                 │
│  Image:             fabric8/s2i-java:3.0-java8                                                                                           │
│  Phase:             Error                                                                                                                │
│  Started At:        2019-11-25T17:09:25Z                                                                                                 │
│Events:              <none>

So we should set some reasonable memory requests for the builder pods so they wont run out of memory, as they are Java Maven builds then they take up a good portion of memory.

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[tadayosi]

It seems to be still relevant.

[squakez]

Done in Camel K version 2: https://camel.apache.org/camel-k/next/traits/builder.html