make the depends_on a list

.drone.yml

@@ -74,7 +74,8 @@ steps:
     environment:
       SSH_KEY:
         from_secret: SSH_KEY
-    depends_on: Format nix
+    depends_on: 
+      - Format nix
   - name: Create pull request
     image: nixery.dev/shell/curl
     commands:
@@ -83,7 +84,8 @@ steps:
     environment:
       AUTHORISATION:
         from_secret: GITEA_KEY
-    depends_on: Push git
+    depends_on:
+      - Push git
 #trigger:
 #  event:
 #    - cron