Convert apikeyprotected-secret to apikey-secret with proper Golang template

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

sample-functions/apikey-secret/handler.go

@@ -0,0 +1,28 @@
+package function
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+)
+
+// Handle a serverless request
+func Handle(req []byte) string {
+
+	key := os.Getenv("Http_X_Api_Key") // converted via the Header: X-Api-Key
+
+	secretBytes, err := ioutil.ReadFile("/run/secrets/secret_api_key") // You must create a secret ahead of time named `secret_api_key`
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	secret := strings.TrimSpace(string(secretBytes))
+
+	message := "Access was denied."
+	if key == secret {
+		message = "You unlocked the function."
+	}
+
+	return message
+}