Add recipe for oskarstark/env-var-extension

oskarstark/env-var-extension/1.0/config/packages/env_var_extension.yaml

@@ -0,0 +1,3 @@
+services:
+    OskarStark\Twig\EnvVarExtension:
+        tags: ['twig.extension']

oskarstark/env-var-extension/1.0/manifest.json

@@ -0,0 +1,5 @@
+{
+    "copy-from-recipe": {
+        "config/": "%CONFIG_DIR%/"
+    }
+}