fixed cli desc for store env var

[zackbradys]

Please check below, if the PR fulfills these requirements:

• Commit(s) and code follow the repositories guidelines.
• Test(s) have been added or updated to support these change(s).
• Doc(s) have been added or updated to support these change(s).

Associated Links:

• N/A

Types of Changes:

• Bugfix

Proposed Changes:

• Fixed CLI description to include the env var for HAULER_STORE_DIR

Verification/Testing of Changes:

zackbradys@Zacks-MacBook-Pro-2 hauler % ./dist/hauler_darwin_arm64_v8.0/hauler help
Airgap Swiss Army Knife

Usage:
  hauler [flags]
  hauler [command]

Examples:
  View the Docs: https://docs.hauler.dev
  Environment Variables: HAULER_DIR | HAULER_TEMP_DIR | HAULER_STORE_DIR | HAULER_IGNORE_ERRORS

Available Commands:
  completion  Generate auto-completion scripts for various shells
  help        Help about any command
  login       Login to a registry
  store       Interact with the content store
  version     Print the current version

Flags:
  -d, --haulerdir string   Set the location of the hauler directory (default $HOME/.hauler)
  -h, --help               help for hauler
      --ignore-errors      Ignore/Bypass errors (i.e. warn on error) (defaults false)
  -l, --log-level string   Set the logging level (i.e. info, debug, warn) (default "info")

Use "hauler [command] --help" for more information about a command.

Additional Context:

• N/A