Add an option to run local development

[yaacov]

Problem:
It is not convenient to set up the API server for local development,
for example, when developing the UI it is sometimes nice to have a way to connect to a local forklift-must-gather-api server.

What happen:
Currently the server is hard coded to use in cluster configuration files:

"/var/run/secrets/kubernetes.io/serviceaccount/token"
"/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"

Settings this files on a developer machine requires root access.

Suggested solution:
Allow to use local kubeconfig file ( default or using $KUBECONFIG ) using an environment variable flag.

var	description	default value
USE_KUBECONFIG	use local user's kubeconfig when fetching data from k8s server ("false"/"true")	"false"

For example:

PORT=9200 USE_KUBECONFIG=true go run pkg/must-gather-api.go

Ref: #11

Signed-off-by: yzamir [email protected]

[yaacov]

@fbladilo hi, tests fail on main too ... ( fails on my laptop too ) can I run tests locally ?

[aufi]

@yaacov Thanks for the PR, looks good to me 👍

[yaacov]

@aufi can we merge it?

[aufi]

Build error is unrelated, merging.