fix nginx.ingress.kubernetes.io/force-ssl-redirect="true" with cloudlare

cloudflare-forwarded-port-cm.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: cloudflare-forwarded-port
  namespace: ingress-nginx
data:
  main.lua: |
    local ngx = ngx

    local _M = {}

    function _M.rewrite()
      if (ngx.var.http_cf_visitor and ngx.var.http_cf_visitor:find( "https")) then
         -- ngx.log(ngx.WARN, "testssl headers ", ngx.req.get_headers())
         ngx.req.set_header("X-Forwarded-Proto", "https")
         ngx.req.set_header("X-Forwarded-Port", "443")
      end
    end

    return _M

main.lua

local ngx = ngx
local _M = {}
function _M.rewrite()
  if (ngx.var.http_cf_visitor and ngx.var.http_cf_visitor:find( "https")) then
     -- ngx.log(ngx.WARN, "testssl headers ", ngx.req.get_headers())
     ngx.req.set_header("X-Forwarded-Proto", "https")
     ngx.req.set_header("X-Forwarded-Port", "443")
  end
end
return _M

nginx-conf.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-configuration
  namespace: ingress-nginx
  labels:
    app: ingress-nginx
data:
  [...]
  plugins: "cloudflare-forwarded-port"

nginx-ds.yaml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
spec:
  template:
    spec:
      containers:
        - name: nginx-ingress-controller
          volumeMounts:
          - name: cloudflare-forwarded-port
            mountPath: /etc/nginx/lua/plugins/cloudflare-forwarded-port
      volumes:
      - name: cloudflare-forwarded-port
        configMap:
          name: cloudflare-forwarded-port