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>

ops/schema/openssh-lpk.schema

@@ -0,0 +1,20 @@
+# OpenSSH LDAP Public Key (openssh-lpk) schema, the widely-used Buchan
+# openssh-lpk definition (OIDs under 1.3.6.1.4.1.24552.500.1).
+#
+# The SSO app (nodejs/models/user_ldap.js) stores each user's SSH public key in
+# the `sshPublicKey` attribute and tags the user entry with the `ldapPublicKey`
+# auxiliary objectClass, so the directory must know both for user create/update
+# to succeed. ldapPublicKey is AUXILIARY (as in upstream openssh-lpk), so it
+# attaches cleanly onto the inetOrgPerson user entry.
+
+attributetype ( 1.3.6.1.4.1.24552.500.1.1
+	NAME 'sshPublicKey'
+	DESC 'SSH public key'
+	EQUALITY octetStringMatch
+	SYNTAX 1.3.6.1.4.1.1466.115.121.1.40 )
+
+objectclass ( 1.3.6.1.4.1.24552.500.1.2
+	NAME 'ldapPublicKey'
+	DESC 'SSH public key user'
+	SUP top AUXILIARY
+	MAY sshPublicKey )