Use a cargo cache for the clippy CI job.

.lighthouse/pipeline-clippy.yaml

@@ -79,6 +79,8 @@ spec:
         workspaces:
           - name: source
             workspace: git-source
+          - name: cargo-cache
+            workspace: cargo-cache
         runAfter:
           - fetch-repository
         params:
@@ -157,7 +159,7 @@ spec:
       subPath: rust-source
     - name: cargo-cache
       persistentVolumeClaim:
-        claimName: organic-cargo-cache-fmt
+        claimName: organic-cargo-cache-clippy
     - name: docker-credentials
       secret:
         secretName: harbor-plain