Change require to actual name of file resource

manifests/environments.pp

@@ -14,7 +14,7 @@ class anaconda::environments {
   exec { 'setupvanilla3':
     unless  => "conda env list | grep -q 'vanilla3'",
     command => 'conda env create -f /opt/envs/vanilla3.yml',
-    require => File[vanilla3.yml],
+    require => File['/opt/envs/vanilla3.yml'],
     path    => ['/bin','/opt/miniconda/bin']
   }