Add recipe for treblle/treblle-symfony

Registers TreblleBundle, copies a minimal treblle.yaml config pointing
at TREBLLE_SDK_TOKEN and TREBLLE_API_KEY env vars, and injects those
two variables into .env on install.

Author: cindreta

treblle/treblle-symfony/4.0/config/packages/treblle.yaml

@@ -0,0 +1,3 @@
+treblle:
+    sdk_token: '%env(TREBLLE_SDK_TOKEN)%'
+    api_key: '%env(TREBLLE_API_KEY)%'

treblle/treblle-symfony/4.0/manifest.json

@@ -0,0 +1,12 @@
+{
+    "bundles": {
+        "Treblle\\Symfony\\TreblleBundle": ["all"]
+    },
+    "copy-from-recipe": {
+        "config/": "%CONFIG_DIR%/"
+    },
+    "env": {
+        "TREBLLE_SDK_TOKEN": "",
+        "TREBLLE_API_KEY": ""
+    }
+}