release(v2.0.4): build Dockerfile.openldap FROM the published base image (#188)

ldapbuild now pulls ghcr.io/theta42/openldap-nestgroup:<pinned commit>
instead of compiling OpenLDAP from source on every build.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

nodejs/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "t42-theta-directory",
-  "version": "2.0.3",
+  "version": "2.0.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "t42-theta-directory",
-      "version": "2.0.3",
+      "version": "2.0.4",
       "license": "MIT",
       "dependencies": {
         "@fortawesome/fontawesome-free": "^7.3.0",