add cache plugin

.woodpecker.yml

@@ -1,10 +1,17 @@
 pipeline:
+  restore-cache:
+    image: drillster/drone-volume-cache
+    settings:
+      restore: true
+      mount:
+        - /nix/store
+    volumes:
+      - /var/lib/woodpecker/cache/nixstore:/cache
+
   check:
     image: nixpkgs/nix-flakes:latest
     pull: true
     commands:
       - nix --no-sandbox flake info
       - nix --no-sandbox develop -c statix check
-    volumes:
-      - /var/lib/woodpecker/cache/nixstore:/nix/store
 

nixos/boxes/vpsfree1/woodpecker.nix

@@ -3,7 +3,7 @@ let
   httpPort = 8000;
   agentPort = 9000;
   domain = "ci.cyplo.dev";
-  path = "/var/lib/woodpecker";
+  path = "/var/lib/woodpecker/data";
   serverContainerName = "woodpecker-server";
 
 in {