feat: allow extra env vars for addons

[smasset-orange]

Adds extraEnvs to all current addon specs to allow setting extra envvars to the addon's containers.

My main use case is setting KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT to allow CoreDNS and konnectivity-agent to start on Tenant cluster nodes when Kamaji is running behind external LB.

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[prometherion]

@smasset-orange we can accept this contribution, let's focus on getting CI green tho.

[smasset-orange]

@smasset-orange we can accept this contribution, let's focus on getting CI green tho.

Removed commit with changes to e2e Makefile target for now.
Not sure yet why CI pipeline wasn't starting kind cluster with e2e-setup as a dependency for e2e but I'll check that later

[smasset-orange]

@smasset-orange we can accept this contribution, let's focus on getting CI green tho.

Removed commit with changes to e2e Makefile target for now. Not sure yet why CI pipeline wasn't starting kind cluster with e2e-setup as a dependency for e2e but I'll check that later

I think I've found it...

[smasset-orange]

FYI, local e2e tests results :

Summarizing 3 Failures:
  [FAIL] starting a kind worker with kubeadm [It] should join the Tenant Control Plane cluster
  /workspaces/kamaji/e2e/worker_kubeadm_join_test.go:185
  [FAIL] When migrating a Tenant Control Plane to another datastore (postgresql) [It] Should contain all the migrated data
  /workspaces/kamaji/e2e/tcp_migration_test.go:86
  [FAIL] When migrating a Tenant Control Plane to another datastore (etcd) [It] Should contain all the migrated data
  /workspaces/kamaji/e2e/tcp_migration_test.go:86

Ran 30 of 30 Specs in 866.236 seconds
FAIL! -- 27 Passed | 3 Failed | 0 Pending | 0 Skipped

Tests in tcp_migration_test.go are failing because I'm running all of this from a dev container and can't handle randomly selected network profile ports and redirect them to the docker host using extraPortMappings in kind config.

Pretty much the same with the test in worker_kubeadm_join_test.go as I can't segregate the test containers from kind cluster create from the Makefile.

I'm confident they'll pass when run from the CI though.

[smasset-orange]

Tests are passing. Pushed missing changes to API doc.

[prometherion]

Let's see the CI, as I said, we can get this merged.

I've tried to reach out to you privately using your email address since I'm a bit puzzled by your use-case, such as overriding environment variables. It would be great if we could connect.

[smasset-orange]

Missed your private email. Will reply later today.

[smasset-orange]

Successfully tested on CoreDNS addon after publishing image and Helm chart to local repositories.
@prometherion anything missing (beside your review) to merge this ?

[smasset-orange]

Rebased against latest changes on master branch