installs docker container CA certificate

so that we are able to run a test that does not specific CACERT
and so the library fallsback to system cert store

Author: vroldanbet

.travis.yml

@@ -24,7 +24,8 @@ before_install:
 
 install:
   - docker run --hostname ldap.example.org --env LDAP_TLS_VERIFY_CLIENT=try -p 389:389 -p 636:636 -v $(pwd)/test/fixtures/seed.ldif:/container/service/slapd/assets/config/bootstrap/ldif/50-bootstrap.ldif -v $(pwd)/test/fixtures/openldap/retcode.ldif:/container/service/slapd/assets/config/bootstrap/ldif/06-retcodes.ldif --name openldap --detach osixia/openldap:1.3.0 --copy-service --loglevel debug
-  - docker cp openldap:/container/run/service/:ssl-tools/assets/default-ca/default-ca.pem /tmp/openldap-ca.pem
+  - cp $(pwd)/test/fixtures/ca/docker-ca.pem /etc/ssl/certs/cacert.pem
+  - update-ca-certificates
   - bundle install
 
 script: bundle exec rake ci

test/integration/test_bind.rb

@@ -210,6 +210,7 @@ def test_bind_tls_with_multiple_bogus_hosts_ca_check_only_fails
   def test_bind_tls_valid_hostname_system_ca_on_travis_passes
     omit_unless ENV['TRAVIS'] == 'true'
 
+    @ldap.host = INTEGRATION_HOSTNAME
     @ldap.encryption(
       method: :start_tls,
       tls_options: { verify_mode: OpenSSL::SSL::VERIFY_PEER },