fix: rename WHOAMI_PORT to WHOAMI_PORT_NUMBER

k8s creates env var based on service name,
then WHOAMI_PORT exists and contains a URL instead of a number.

Author: ldez

README.md

@@ -22,7 +22,7 @@ Tiny Go webserver that prints os information and HTTP request to output
 
 - `cert`: give me a certificate.
 - `key`: give me a key.
-- `port`: give me a port number. (it can be also defined with `WHOAMI_PORT` environment variable) (default: 80)
+- `port`: give me a port number. (it can be also defined with `WHOAMI_PORT_NUMBER` environment variable) (default: 80)
 - `name`: give me a name. (it can be also defined with `WHOAMI_NAME` environment variable)
 
 ## Examples

app.go

@@ -43,7 +43,7 @@ func init() {
 	flag.StringVar(&cert, "cert", "", "give me a certificate")
 	flag.StringVar(&key, "key", "", "give me a key")
 	flag.StringVar(&ca, "cacert", "", "give me a CA chain, enforces mutual TLS")
-	flag.StringVar(&port, "port", getEnv("WHOAMI_PORT", "80"), "give me a port number")
+	flag.StringVar(&port, "port", getEnv("WHOAMI_PORT_NUMBER", "80"), "give me a port number")
 	flag.StringVar(&name, "name", os.Getenv("WHOAMI_NAME"), "give me a name")
 }