drupal installed and running

config/sync/image.style.thumbnail.yml

@@ -0,0 +1,17 @@
+uuid: 2f8150e3-3fb2-4e69-b44e-b89824e444d4
+langcode: fr
+status: true
+dependencies: {  }
+_core:
+  default_config_hash: 808S1-h_6g5FXMi1DvZNcUfR0xgbGxZha9cbIFIeiUQ
+name: thumbnail
+label: 'Vignette (100x100)'
+effects:
+  1cfec298-8620-4749-b100-ccb6c4500779:
+    uuid: ''
+    id: image_scale
+    weight: 0
+    data:
+      width: 100
+      height: 100
+      upscale: false