Add sccache namespace

Ref. swh/infra/sysadm-environment#5400 (closed)

Depends on !45 (merged)

assigned to @olasd

added 2 commits

• 02df8334 - Deploy local-path-provisioner for persistent volumes in the admin cluster
• 75dfe351 - admin-rke2: add sccache namespace

Compare with previous version

merged manually