More build tweaking

.woodpecker/build.yaml

@@ -1,9 +1,3 @@
-when:
-  - event: push
-    branch: master
-  - event: pull_request
-    branch: master
-
 clone:
   git:
     image: woodpeckerci/plugin-git
@@ -19,6 +13,17 @@ steps:
       - rustup component add clippy rustfmt
       - cargo fmt --check
       - cargo clippy -- -D warnings
+    volumes:
+      - /woodpecker/cargo/registry:/usr/local/cargo/registry
+    when:
+      - event: [push, pull_request]
+        path:
+          include:
+            - src/**/*
+            - Cargo.toml
+            - Cargo.lock
+            - Dockerfile
+            - .woodpecker/*
 
   - name: build docker image
     image: woodpeckerci/plugin-docker-buildx
@@ -35,4 +40,11 @@ steps:
       platforms: linux/amd64
     when:
       - event: push
-        branch: master
+        branch: master
+        path:
+          include:
+            - src/**/*
+            - Cargo.toml
+            - Cargo.lock
+            - Dockerfile
+            - .woodpecker/*