ci: unify cache path for shell and docker runners

.gitlab-ci.yml

@@ -19,9 +19,9 @@ variables:
   BASE_IMAGE: ${REGISTRY}/picodata-build-base
   BASE_IMAGE_LATEST: latest
   MAIN_BRANCH: &main-branch master
-  CARGO_HOME: /shared-storage/picodata/.cargo
+  CARGO_HOME: /data/shared-storage/picodata/.cargo
   CACHE_PATHS: target .venv picodata-webui/node_modules
-  CACHE_ARCHIVE: /shared-storage/picodata/cache-v2.tar
+  CACHE_ARCHIVE: /data/shared-storage/picodata/cache-v2.tar
   # Helps to tolerate spurious network failures
   GET_SOURCES_ATTEMPTS: 3
   NO_CACHE: