add parameter to su_apache::module to suppress apache service restart

manifests/module.pp

@@ -7,9 +7,13 @@
 #     su_apache::module { "rewrite": ensure => present }
 #
 # This infrastructure, and therefore this define, is only available on Debian.
+#
+# $restart_apache: restart the Apache service. Defaults to true; set to
+# false for Docker container builds.
 
 define su_apache::module(
-  Enum['present', 'absent'] $ensure  = undef,
+  Enum['present', 'absent'] $ensure         = undef,
+  Boolean                   $restart_apache = true,
 ) {
   if ($::operatingsystem != 'debian') and ($::operatingsystem != 'ubuntu') {
     fail("Unsupported su_apache::module operating system ${::operatingsystem}")
@@ -30,11 +34,21 @@ define su_apache::module(
   }
 
   # Enable or disable the module using a2enmod or a2dismod.
-  exec { $cmd:
-    command => $cmd,
-    path    => '/usr/sbin:/usr/bin',
-    require => Package['apache'],
-    unless  => "[ $condition ]",
-    notify  => Exec['su_apache_reload'];
+  if ($restart_apache) {
+    # DO an Apache service restart.
+    exec { $cmd:
+      command => $cmd,
+      path    => '/usr/sbin:/usr/bin',
+      require => Package['apache'],
+      unless  => "[ $condition ]",
+      notify  => Exec['su_apache_reload'],
+    }
+  } else {
+    # DON'T do an Apache service restart.
+    exec { $cmd:
+      command => $cmd,
+      path    => '/usr/sbin:/usr/bin',
+      require => Package['apache'],
+      unless  => "[ $condition ]",
   }
 }