try different cache config syntax

.woodpecker.yml

@@ -1,10 +1,9 @@
 pipeline:
-  restore-cache:
+   restore-cache:
     image: drillster/drone-volume-cache
-    settings:
-      restore: true
-      mount:
-        - /nix/store
+    restore: true
+    mount:
+      - /nix/store
     volumes:
       - /var/lib/woodpecker/cache:/cache
 
@@ -15,12 +14,10 @@ pipeline:
       - nix --no-sandbox flake info
       - nix --no-sandbox develop -c statix check
 
-  save-cache:
+  rebuild-cache:
     image: drillster/drone-volume-cache
-    pull: true
-    settings:
-      rebuild: true
-      mount:
-        - /nix/store
+    rebuild: true
+    mount:
+      - /nix/store
     volumes:
       - /var/lib/woodpecker/cache:/cache