better approach

symfony/panther/1.0/manifest.json

@@ -1,10 +1,4 @@
 {
-    "copy-from-recipe": {
-        "error-screenshots/": "tests/error-screenshots/"
-    },
-    "gitignore": [
-        "/tests/error-screenshots/*.png"
-    ],
     "dockerfile": [
         "# Chromium and ChromeDriver",
         "ENV PANTHER_NO_SANDBOX 1",

symfony/phpunit-bridge/3.3/manifest.json

@@ -8,7 +8,8 @@
     "gitignore": [
         ".phpunit",
         ".phpunit.result.cache",
-        "/phpunit.xml"
+        "/phpunit.xml",
+        "error-screenshots/"
     ],
     "aliases": ["simple-phpunit"]
 }