Update test action

Author: HarlemSquirrel

.github/workflows/test.yml

@@ -19,16 +19,14 @@ jobs:
       INTEGRATION: openldap
     runs-on: ubuntu-latest
     services:
-      openldap:
+      'ldap.example.org':
         image: osixia/openldap:1.4.0
         env:
           LDAP_SEED_INTERNAL_LDIF_PATH: ${{ github.workspace }}/test/fixtures/ldif
           LDAP_TLS_VERIFY_CLIENT: try
         ports:
           - 389:389
           - 636:636
-        options: >-
-          --hostname ldap.example.org
     strategy:
       matrix:
         ruby:
@@ -58,6 +56,9 @@ jobs:
     #     osixia/openldap:1.3.0 \
     #       --copy-service \
     #       --loglevel debug \
+    - name: Set up /etc/hosts
+      run: |
+        echo '127.0.0.1 ldap.example.org' | sudo tee -a /etc/hosts
     - name: Install dependencies
       run: pwd; bundle install
     - name: Run tests