add a controller and custom uploader

[takeshi-yoshimura]

Hi @No9,
This is our operator to support multiple users with buckets per namespace.
The code change might be too large to be merged immediately, but we can separate this later if we need to do so.

This PR adds two new components written in Golang.

• Uploader for multiple users: cmd/core-dump-uploader
• Controller: controllers and api/v1alpha1.

This also modifies CRD. See the generated .yaml file config/crd/bases/charts.ibm.com_coredumphandlers.yaml.

The controller is a re-implementation of what the helm chart did roughly. It deploys a daemonset with a pod running the new uploader and core-dump-agent.

[No9]

Thanks @takeshi-yoshimura
As per the repo check can you sign the commit with a DCO.
Also as we have access to worflows here are there any tests that we can run on a commit to validate updates?

[takeshi-yoshimura]

@No9
I added a sign-off. thanks.

You can run make uploader-test and make operator-test (go is required). But operator tests are not implemented yet. It just returns 0% coverage now. I will incrementally add tests later.

[takeshi-yoshimura]

I added workflows for unit tests and image builds. I also set the required secrets in this repo so that we can start workflows after the code is merged into the master branch. thanks.