ci: build-yocto: add CACHE_DIR env

This variable will point to the persistent cache storage.

Signed-off-by: Jose Quaresma <[email protected]>

.github/workflows/build-yocto.yml

@@ -63,8 +63,9 @@ jobs:
 
       - name: Kas build
         run: |
-          export DL_DIR=/srv/gh-runners/quic-yocto/downloads
-          export SSTATE_DIR=/srv/gh-runners/quic-yocto/sstate-cache
+          export CACHE_DIR=/srv/gh-runners/quic-yocto
+          export DL_DIR=${CACHE_DIR}/downloads
+          export SSTATE_DIR=${CACHE_DIR}/sstate-cache
           mkdir -p $DL_DIR
           mkdir -p $SSTATE_DIR
           mkdir build