v1.21.4

Changes

• Disable raw Docker Compose TTY output for multi-host stack fan-out, fixing interleaved cursor-control junk in commands like cf update --all when glances runs on all hosts.
• Keep raw output for true single-target operations and host-filtered multi-host operations.
• Ignore GitHub Actions Docker cache export failures so image publishing is less brittle.

Verification

• uv run pytest tests/test_cli_lifecycle.py tests/test_executor.py tests/test_operations.py
• uv run ruff check .
• uv run ruff format --check .
• uv run cf update glances