build: move .ccache out of WORKING_DIR

You-Sheng Yangrequested to merge
vicamo-guest/pipeline:for-upstream/move-ccache-out-of-working-dir into master

Anything under ${WORKING_DIR} will be saved as job artifacts, and .ccache should not be in the list.

Closes: #107 (closed)

Edited by You-Sheng Yang

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