Update the sample functions

**What**
- Move the new secrets sample function to ApiKeyProtected-Secrets
- Bring back the original ApiKeyProtected sample function

Signed-off-by: Lucas Roesler <roesler.lucas@gmail.com>

sample-functions/ApiKeyProtected-Secrets/handler.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+)
+
+func handle(body []byte) {
+	key := os.Getenv("Http_X_Api_Key")
+
+	secretBytes, err := ioutil.ReadFile("/run/secrets/secret_api_key")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	secret := strings.TrimSpace(string(secretBytes))
+
+	if key == secret {
+		fmt.Println("Unlocked the function!")
+	} else {
+		fmt.Println("Access denied!")
+	}
+}
+
+func main() {
+	bytes, _ := ioutil.ReadAll(os.Stdin)
+	handle(bytes)
+}