Allow overriding of COOKIE_SECURE

[rlabrecque]

buzzfeed-sso/templates/proxy-deployment.yaml

Line 84 in 23dff57

- name: COOKIE_SECURE

Setting this to false is required in my case for some reason. Otherwise I get stuck in a 301 Moved Permanently loop where it keeps redirecting me back to the same page. Likely something to do with my AWS NLB -> nginx-ingress -> buzzfeed-sso setup with https termination. (Or because I haven't put tls stuff in my values.yaml yet? We'll see tomorrow!)

Why's it on by default anyway? It's off in both the buzzfeed-sso kubernetes quickstart:
https://github.com/buzzfeed/sso/blob/master/quickstart/kubernetes/sso-auth-deployment.yml
and on the only other place documenting buzzfeed-sso on k8s: https://medium.com/@while1eq1/single-sign-on-for-internal-apps-in-kubernetes-using-google-oauth-sso-2386a34bc433

Thanks!