fix: add .stable suffix to JuiceFS mount path for stable channel

The JuiceFS Python wrapper expects the mount binary to have a channel suffix
(.stable or .beta). Without this suffix, it tries to auto-download a
non-existent file for arm64 architecture, causing the build to fail.

Author: elijah-rou

docker/csi.Dockerfile

@@ -84,7 +84,7 @@ RUN apt-get update && apt-get install -y curl fuse procps iputils-ping strace ip
 
 RUN jfs_mount_path=${JFS_MOUNT_PATH} && \
   bash -c "if [[ '${JFSCHAN}' == beta ]]; then curl -sSL https://static.juicefs.com/release/bin_pkgs/beta_full.tar.gz | tar -xz; jfs_mount_path=${JFS_MOUNT_PATH}.beta; \
-  else curl -sSL https://static.juicefs.com/release/bin_pkgs/latest_stable_full.tar.gz | tar -xz; fi;" && \
+  else curl -sSL https://static.juicefs.com/release/bin_pkgs/latest_stable_full.tar.gz | tar -xz; jfs_mount_path=${JFS_MOUNT_PATH}.stable; fi;" && \
   bash -c "mkdir -p /usr/local/juicefs/mount; if [[ '${TARGETARCH}' == amd64 ]]; then cp Linux/mount.ceph $jfs_mount_path; else cp Linux/mount.aarch64 $jfs_mount_path; fi;" && \
   chmod +x ${jfs_mount_path} && cp juicefs.py ${JUICEFS_CLI} && chmod +x ${JUICEFS_CLI}