Cannot use sccache due to permission denied

[garasubo]

I use cross-rs in CI. To improve build time, I'm trying to introduce sccache.
I found the recipe to use sccache here: https://github.com/cross-rs/cross/wiki/Recipes#sccache
I created my own custom image with installing sccache v0.8.0 and tried to build with following command:

RUSTC_WRAPPER=sccache SCCACHE_DIR=./cache cross build -v --target=armv7-unknown-linux-gnueabihf 

But this casued following error:

error: failed to run custom build command for `lz4-sys v1.9.4`

Caused by:
  process didn't exit successfully: `/target/debug/build/lz4-sys-26860c6e4aacfaf2/build-script-build` (exit status: 1)
  --- stdout
  TARGET = Some("armv7-unknown-linux-gnueabihf")
  HOST = Some("x86_64-unknown-linux-gnu")
  cargo:rerun-if-env-changed=CC_armv7-unknown-linux-gnueabihf
  CC_armv7-unknown-linux-gnueabihf = None
  cargo:rerun-if-env-changed=CC_armv7_unknown_linux_gnueabihf
  CC_armv7_unknown_linux_gnueabihf = None
  cargo:rerun-if-env-changed=TARGET_CC
  TARGET_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  RUSTC_LINKER = Some("arm-linux-gnueabihf-gcc")
  cargo:rerun-if-env-changed=CROSS_COMPILE
  CROSS_COMPILE = None
  cargo:rerun-if-env-changed=CFLAGS_armv7-unknown-linux-gnueabihf
  CFLAGS_armv7-unknown-linux-gnueabihf = None
  cargo:rerun-if-env-changed=CFLAGS_armv7_unknown_linux_gnueabihf
  CFLAGS_armv7_unknown_linux_gnueabihf = None
  cargo:rerun-if-env-changed=TARGET_CFLAGS
  TARGET_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("true")
  CARGO_CFG_TARGET_FEATURE = None
  running: "sccache" "arm-linux-gnueabihf-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-gdwarf-4" "-fno-omit-frame-pointer" "-march=armv7-a" "-mfpu=vfpv3-d16" "-Wall" "-Wextra" "-o" "/target/armv7-unknown-linux-gnueabihf/debug/build/lz4-sys-ea230926a7b78ca1/out/liblz4/lib/lz4.o" "-c" "liblz4/lib/lz4.c"
  cargo:warning=sccache: encountered fatal error
  cargo:warning=sccache: error: failed to create directory `./cache/preprocessor`
  cargo:warning=sccache: caused by: failed to create directory `./cache/preprocessor`
  cargo:warning=sccache: caused by: failed to create directory `./cache/preprocessor`
  cargo:warning=sccache: caused by: Permission denied (os error 13)
  exit status: 254

I created ./cache directory on my host machine, and I set volume property in Cross.toml to mount this directory like this:

[build.env]
volumes = ["SCCACHE_DIR"]
passthrough = [
    "RUST_BACKTRACE",
    "RUSTC_WRAPPER",
    "SCCACHE_DIR",
    "SCCACHE_ERROR_LOG",
    "SCCACHE_LOG",
]

Is there any way to fix this error?

Thanks.