Mount minikube volume to docker container

[zrdaley]

What this PR does / why we need it:
This was removed here: f2bfc42#diff-431621728cbbd3bf22d1c9ac24b0d761L72

However, mounting the minikube volume to the docker container is essential for e2e-tests to run properly. Failing to do so results in the following error:

Expected error:
      <clientcmd.errConfigurationInvalid | len:3, cap:4>: [
          {
              s: "unable to read client-cert $HOME/.minikube/client.crt for minikube due to open $HOME/.minikube/client.crt: no such file or directory",
          },
          {
              s: "unable to read client-key $HOME/.minikube/client.key for minikube due to open $HOME/.minikube/client.key: no such file or directory",
          },
          {
              s: "unable to read certificate-authority $HOME/.minikube/ca.crt for minikube due to open $HOME/.minikube/ca.crt: no such file or directory",
          },
      ]
      invalid configuration: [unable to read client-cert $HOME/.minikube/client.crt for minikube due to open $HOME/.minikube/client.crt: no such file or directory, unable to read client-key $HOME/.minikube/client.key for minikube due to open $HOME/.minikube/client.key: no such file or directory, unable to read certificate-authority $HOME/.minikube/ca.crt for minikube due to open $HOME/.minikube/ca.crt: no such file or directory]
  not to have occurred

[aledbf]

@zrdaley can you do this in a variable if the directory exists? (I removed the mount because it also breaks for those without minikube)

[diazjf]

This will help alot 👍

[diazjf]

Tested both positive and negative cases. Works Great!!

[aledbf]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, zrdaley

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [aledbf]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[aledbf]

@zrdaley thanks!

[aledbf]

Merging.