Merge branch 'nrbffs/ci-cache-paths' into 'master'

CI: explicitly specify what to cache

See merge request !2
3 jobs for nrbffs/test in 48 minutes and 5 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #235
target:x86-64

00:48:05

failed #233
target:x86-64

00:47:56

 
  Package
skipped #234
package
 
Name Stage Failure
failed
target:x86-64 Build
make[2]: *** [/builds/firmware/site-ffs/gluon/openwrt/staging_dir/target-x86_64_musl/stamp/.package_compile] Error 2
make -r world: build failed. Please re-run make with -j1 V=s or V=sc for a higher verbosity level to see what's going on
make[1]: *** [world] Error 1
make: *** [all] Error 2
/builds/firmware/site-ffs/gluon/openwrt/include/toplevel.mk:216: recipe for target 'world' failed
make[1]: Leaving directory '/builds/firmware/site-ffs/gluon/openwrt'
Makefile:148: recipe for target 'all' failed
make: Leaving directory '/builds/firmware/site-ffs/gluon'
ERROR: Job failed: exit code 1