Add "overwrite" Flag to Label Command in Init-Container

[Neumann-Nils]

Description

When scaling the Karydia deployment (i.e. while hibernating) and re-scaling the deployment, the init container may fail starting. This is due to the following command:

kubectl label namespace kube-system karydia.gardener.cloud/name=kube-system

As the label already exists, the command fails and the pod cannot start. To fix this issue, one needs to add the overwrite flag to the command.

Checklist

Before submitting this PR, please make sure:

• [x] your code builds clean with make
• [x] your code lets succeed unit tests with make test
• [x] your code lets succeed integration tests