Load sudo + openssh-lpk schemas in the all-in-one image; fix schema COPY

The SSO app (nodejs/models/user_ldap.js addPosixAccount) tags every new user
with objectClasses [inetOrgPerson, sudoRole, ldapPublicKey, posixAccount, top,
theta42Person] and writes sudoHost/sudoCommand/sudoUser + sshPublicKey. The
all-in-one image's slapd.conf only included core/cosine/inetorgperson/nis +
theta42, so creating a user failed: sudoRole and ldapPublicKey were unknown
objectClasses (LDAP objectClassViolation 65) and sudoHost/sudoCommand/sudoUser
and sshPublicKey were unknown attributes.

Ship the two missing schemas and include them in slapd.conf:
  - ops/schema/sudo.schema       (sudoRole + sudo* attributes)
  - ops/schema/openssh-lpk.schema (sshPublicKey + ldapPublicKey)

sudoRole is AUXILIARY here, not STRUCTURAL as in upstream sudo. The app
attaches sudoRole directly onto the user entry, which is already inetOrgPerson
(STRUCTURAL); two unrelated structural classes violate RFC 4512 and OpenLDAP
rejects with 65. AUXILIARY lets it coexist with inetOrgPerson — the app's
per-user-sudoers model. sudo's LDAP backend still finds entries via
(objectClass=sudoRole) regardless. ldapPublicKey is AUXILIARY as in upstream
openssh-lpk.

Also fix the build error from the previous theta42 schema PR: .dockerignore
excluded all of ops/, so 'COPY ops/schema/theta42.schema' failed at build
time ('not found' — file is git-tracked but stripped from the context). Re-
include ops/schema/*.schema with !exceptions, matching the existing
README.md/tos.md pattern.

Co-Authored-By: Claude <noreply@anthropic.com>

.dockerignore

@@ -37,8 +37,11 @@ Dockerfile*
 docker-compose.yml
 .dockerignore
 
-# Ops scripts (not needed in container)
+# Ops scripts (not needed in container) — except the custom LDAP schema files,
+# which Dockerfile.openldap COPYs into the image for the bundled slapd.
 ops/
+!ops/schema/
+!ops/schema/*.schema
 
 # Secrets (mount at runtime instead)
 nodejs/conf/secrets.js