add generate_cert.sh script

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

scripts/generate_cert.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+[ $# -ne 1 ] && {
+    echo "Usage: ${0} <hostname>"
+    exit 1
+}
+
+echo "Generating TLS cert + privkey for: ${1}"
+openssl req -x509 -newkey rsa:4096 -sha256 \
+            -days 365 -nodes -keyout "${1}.key" \
+            -out "${1}.crt" -subj "/CN=${1}" \
+            -addext "subjectAltName=DNS:${1}"