- adding additional environment config options (#95)

config.go

@@ -349,6 +349,7 @@ func getOptions() []cli.Flag {
 			Name:   "listen",
 			Usage:  "the interface the service should be listening on",
 			Value:  defaults.Listen,
+			EnvVar: "PROXY_LISTEN",
 		},
 		cli.StringFlag{
 			Name:   "client-secret",
@@ -376,6 +377,7 @@ func getOptions() []cli.Flag {
 		cli.DurationFlag{
 			Name:   "idle-duration",
 			Usage:  "the expiration of the access token cookie, if not used within this time its removed",
+			EnvVar: "PROXY_IDLE_DURATION",
 		},
 		cli.StringFlag{
 			Name:   "redirection-url",
@@ -386,6 +388,7 @@ func getOptions() []cli.Flag {
 			Name:   "revocation-url",
 			Usage:  "the url for the revocation endpoint to revoke refresh token",
 			Value:  "/oauth2/revoke",
+			EnvVar: "PROXY_REVOCATION_URL",
 		},
 		cli.StringFlag{
 			Name:   "store-url",
@@ -460,7 +463,7 @@ func getOptions() []cli.Flag {
 		},
 		cli.StringSliceFlag{
 			Name:  "forwarding-domains",
-			Usage: "a list of domains which should be signed, anything is just relayed",
+			Usage: "a list of domains which should be signed; everything else is relayed unsigned",
 		},
 		cli.StringFlag{
 			Name:  "tls-cert",