Update generate_cert.sh to accept env variables

resources/generate_cert.sh

@@ -1,25 +1,24 @@
 #!/bin/bash
 
-# Directory where the certificate and key will be stored
-CERT_DIR="$HOME/.nginx"
-
-# Certificate and key configuration
-ALG_NAME="rsa"
-ALG_SIZE="4096"
-DAYS="3650"
-CN="ip.aumaton.com"
+# Key and certificate configuration
+ALG_NAME=${ALG_NAME:-rsa}
+ALG_SIZE=${ALG_SIZE:-4096}
+DAYS=${DAYS:-3650}
+CN=${CN:-ip.aumaton.com}
 
+# Directory where the key and certificate will be stored
+CERT_DIR="$HOME/.nginx"
 
-# Check if the directory exists, create if not
+# Make sure CERT_DIR exists
 if [ ! -d "$CERT_DIR" ]; then
   mkdir -p "$CERT_DIR"
 fi
 
 # Set the filenames
-CERT_FILE="$CERT_DIR/cert.pem"
 KEY_FILE="$CERT_DIR/key.pem"
+CERT_FILE="$CERT_DIR/cert.pem"
 
 # Generate the key and certificate
 openssl req -x509 -newkey $ALG_NAME:$ALG_SIZE -keyout "$KEY_FILE" -out "$CERT_FILE" -days $DAYS -nodes -subj "/CN=$CN"
 
-echo "Certificate and key have been generated in $CERT_DIR"
+echo "Key and certificate have been generated in $CERT_DIR"