BUGFIX: Missing disk tools (sfdisk, mkfs.ext4, etc.)

Problem

sfdisk not found in container PATH → partitioning fails.

Required packages

In the controller Dockerfile (container image)

RUN apt-get update && apt-get install -y --no-install-recommends \
    fdisk \
    e2fsprogs \
    mount \
    && rm -rf /var/lib/apt/lists/*

Provides:

fdisk package → sfdisk, fdisk, cfdisk
e2fsprogs package → mkfs.ext4, e2fsck, tune2fs
mount package → mount, umount, blkid, findmnt, lsblk

Note: util-linux (which provides lsblk, blkid, mount) is likely already installed as a base dependency. Check with docker exec felhom-controller which lsblk — if it exists, skip mount package. The critical missing ones are fdisk and e2fsprogs.

On the host node (docker-setup.sh)

These should already exist on a standard Debian 13 install, but ensure:

apt-get install -y fdisk e2fsprogs util-linux

Add to docker-setup.sh's dependency installation section if not already there. The host needs these for mount -a (fstab reload) and as fallback.

Quick verification after rebuild

docker exec felhom-controller which sfdisk mkfs.ext4 blkid mount lsblk
# Should show paths for all five

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