added support for DOMAIN env var insted of file

scripts/setup.sh

@@ -38,10 +38,18 @@ makeNextSubmodule() {
 checkFile "$PWD/src/server.ts"
 checkFile "$PWD/package.json"
 checkFile "$PWD/package-lock.json"
-if [ ! -f "${domainPath}" ]; then
-    error "${domainPath} does not exist!"
-    echo "Please create it, and re-run this script."
-    echo "Expected content: domain, ex.:'frylabs.net' (without http:// and /)"
+
+domain="${DOMAIN}"
+
+if [ -z "${domain}" ] && [ -f "${domainPath}" ]; then
+    domain=$(cat "${domainPath}")
+fi
+
+if [ -z "${domain}" ]; then
+    error "DOMAIN is not set, and ${domainPath} does not exist!"
+    echo "Set DOMAIN to the preferred domain"
+    echo "Or please create the file ${domainPath}, and re-run this script"
+    echo "Expected content: domain, ex.:'frylabs.net' (without 'http://' and '/')"
     exit 1
 fi
 
@@ -113,3 +121,4 @@ fi
 
 # ------------------------------------------------------------------------------------
 log "Done! development mode: 'npm run dev', prod mode: 'npm run start', tests: 'npm run test'"
+exit 0