Implement sccache with redis backend in bookworm-multipython build
This mounts a (potentially empty) SCCACHE_REDIS_ENDPOINT and SCCACHE_REDIS_PASSWORD environment variable into the relevant build commands to use sccache.
This mounts a (potentially empty) SCCACHE_REDIS_ENDPOINT and SCCACHE_REDIS_PASSWORD environment variable into the relevant build commands to use sccache.