Move the cargo cache to the correct task.

.lighthouse/pipeline-rustfmt.yaml

@@ -125,8 +125,6 @@ spec:
         workspaces:
           - name: source
             workspace: git-source
-          - name: cargo-cache
-            workspace: cargo-cache
         runAfter:
           - build-image
         params:
@@ -142,6 +140,8 @@ spec:
         workspaces:
           - name: source
             workspace: git-source
+          - name: cargo-cache
+            workspace: cargo-cache
         runAfter:
           - rustfmt
         params: