[Java] Create endpoint to stream log of integration

[Delawen]

The API already supports deployment of integrations:

• Start a new integration using POST on /integrations
• List all available integrations running using GET on /integrations
• Stop an existing integration (from the previous list?) using DELETE on /integrations

We need to implement a GET /integrations/$name/log endpoint that returns a stream of the log of the integration with name $name.

As a first iteration, instead of streaming, we can just return the current log with a parameter $lines returning the last $lines of the log /integrations/$name/log?lines=$lines .

Implementation Details

The cluster configuration is taken from ~/.kube configuration which can be created with the recommended quick setup for testing.

Recommended quick setup for testing:

• Install kind https://github.com/kubernetes-sigs/kind
• Install camel-k https://camel.apache.org/camel-k/installation/platform/kind.html
• Then run some integration https://camel.apache.org/camel-k/running/running.html

The service that interacts with the cluster is https://github.com/KaotoIO/kaoto-backend/blob/main/cluster/src/main/java/io/kaoto/backend/deployment/ClusterService.java
That service must be called from the resource endpoint https://github.com/KaotoIO/kaoto-backend/blob/main/api/src/main/java/io/kaoto/backend/api/resource/IntegrationResource.java