Add option to ignore SSL error when downloading schemas

[johnowl]

I'm behind a corporate proxy and I receive an error when try to use kubeval, it would be nice if the tool had an option to disable SSL verification, like wget --no-check-certificate or curl -I option.

$ kubeval deployment.yaml kubernetes-deployment.yaml: Failed initalizing schema https://kubernetesjsonschema.dev/master-standalone/deployment-apps-v1beta2.json: Get https://kubernetesjsonschema.dev/master-standalone/deployment-apps-v1beta2.json: x509: certificate signed by unknown authority

[romankor]

i got that to run by

kubeval --additional-schema-locations https://raw.githubusercontent.com/garethr/kubernetes-json-schema/master/

[jnmcfly]

or in case of using apline just apk update \ && apk add ca-certificates \ && rm -rf /var/cache/apk/*