fix: add missing flag name in cut

Signed-off-by: Georg Lauterbach <44545919+georglauterbach@users.noreply.github.com>

Author: georglauterbach

src/vscode-cache-extensions/devcontainer-feature.json

@@ -1,7 +1,7 @@
 // ref: https://github.com/devcontainers/spec/blob/main/schemas/devContainerFeature.schema.json
 {
   "id": "vscode-cache-extensions",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "name": "VS Code | Cache Extensions",
   "documentationURL": "https://github.com/georglauterbach/dev-container-features/tree/main/src/vscode-cache-extensions",
   "description": "Prevent superfluous (re-)installations of VS Code extensions upon container restarts",

src/vscode-cache-extensions/install.sh

@@ -21,7 +21,7 @@ fi
 # `updateRemoteUserUID: true` in some cases, which would result in
 # a UID mismatch; hence, we need `777` as the permissions.
 for LOOP_VAR in "stable," "insiders,-insiders"; do
-  PERSISTENCE_DIR="${CACHE_MOUNT_POINT}/$(printf '%s' "${LOOP_VAR}" | cut -d , - 1)"
+  PERSISTENCE_DIR="${CACHE_MOUNT_POINT}/$(printf '%s' "${LOOP_VAR}" | cut -d , -f 1)"
   TMP_STORAGE_DIR="${_REMOTE_USER_HOME}/.vscode-server$(printf '%s' "${LOOP_VAR}" | cut --delimiter=, --fields=2)"
 
   # shellcheck disable=SC2174