checking for crt before setting up service

scripts/setup_wizard.sh

@@ -128,6 +128,11 @@ export KEY_LOCATION=$(readlink -f $KEY_LOCATION)
 # 2. Confirm
 confirm_inputs "CERT_LOCATION" "KEY_LOCATION"
 
+if [ ! -f "$CERT_LOCATION" ] || [ ! -f "$KEY_LOCATION" ]; then
+    log_error "Certificate or key file does not exist at specified locations."
+    exit 1
+fi
+
 # 3. Configure
 REPO_URL_BASE=https://gitea.john-stream.com/john/soteria/raw/branch/main/
 SERVICE_TEMPLATE_URL="${REPO_URL_BASE}systemd/cert-renewer.service"