Merge branch 'basvandijk/boundary-node-CONFIG-label' into 'master'

chore: set the CONFIG label for the boundary-node config image

This enables boundary-nodes running in Utopia (cloud) environment to
find their config devices. 

See merge request dfinity-lab/public/ic!16654

ic-os/boundary-guestos/scripts/build-bootstrap-config-image.sh

@@ -607,11 +607,15 @@ function build_ic_bootstrap_diskimage() {
     shift
 
     local TMPDIR=$(mktemp -d)
-    build_ic_bootstrap_tar "${TMPDIR}/ic-bootstrap.tar" "$@"
-
-    truncate -s 10M "${OUT_FILE}"
-    mkfs.vfat "${OUT_FILE}"
-    mcopy -i "${OUT_FILE}" -o "${TMPDIR}/ic-bootstrap.tar" ::
+    local TAR="${TMPDIR}/ic-bootstrap.tar"
+    build_ic_bootstrap_tar "${TAR}" "$@"
+
+    size=$(du --bytes "${TAR}" | awk '{print $1}')
+    size=$((2 * size + 1048576))
+    echo "image size: $size"
+    truncate -s $size "${OUT_FILE}"
+    mkfs.vfat -n CONFIG "${OUT_FILE}"
+    mcopy -i "${OUT_FILE}" -o "${TAR}" ::
 
     rm -rf "${TMPDIR}"
 }