update cache dirs

ci/audit.yml

@@ -4,13 +4,15 @@ image_resource:
   type: registry-image
   source: {repository: rust}
 
-# move cargo's config directory to be ./.cargo-config/ and cache it
+# move rust's config directories to be in the current directory, so they can be cached.
 params:
   CARGO_HOME: "./.cargo-config"
+  RUSTUP_HOME: "./.rustup-config"
 
 caches:
   - path: "./repo/target"
   - path: "./repo/.cargo-config"
+  - path: "./repo/.rustup-config"
 
 
 inputs:

ci/build-linux.yml

@@ -4,9 +4,10 @@ image_resource:
   type: registry-image
   source: {repository: rust}
 
-# move cargo's config directory to be ./.cargo-config/ and cache it
+# move rust's config directories to be in the current directory, so they can be cached.
 params:
   CARGO_HOME: "./.cargo-config"
+  RUSTUP_HOME: "./.rustup-config"
 
 caches:
   - path: "./repo/target"

ci/check-fmt.yml

@@ -4,9 +4,15 @@ image_resource:
   type: registry-image
   source: {repository: rust}
 
-# This should cache rustfmt
+# move rust's config directories to be in the current directory, so they can be cached.
+params:
+  CARGO_HOME: "./.cargo-config"
+  RUSTUP_HOME: "./.rustup-config"
+
 caches:
-- path: "./.rustup/"
+  - path: "./repo/target"
+  - path: "./repo/.cargo-config"
+  - path: "./repo/.rustup-config"
 
 inputs:
 - name: repo

ci/lint.yml

@@ -4,11 +4,15 @@ image_resource:
   type: registry-image
   source: {repository: rust}
 
-# This should cache clippy
+# move rust's config directories to be in the current directory, so they can be cached.
+params:
+  CARGO_HOME: "./.cargo-config"
+  RUSTUP_HOME: "./.rustup-config"
+
 caches:
-- path: "./.rustup/"
+  - path: "./repo/target"
-- path: "./.cargo/"
+  - path: "./repo/.cargo-config"
-- path: "./target/"
+  - path: "./repo/.rustup-config"
 
 inputs:
 - name: repo

ci/test.yml

@@ -4,9 +4,10 @@ image_resource:
   type: registry-image
   source: {repository: rust}
 
-# move cargo's config directory to be ./.cargo-config/ and cache it
+# move rust's config directories to be in the current directory, so they can be cached.
 params:
   CARGO_HOME: "./.cargo-config"
+  RUSTUP_HOME: "./.rustup-config"
 
 caches:
   - path: "./repo/target"