v2.2.1

🐛 Bug Fixes

• 130b1f4 - make retry backoff interruptible and cap max delay at 60s (commit by @JPar99)
• 0176843 - require both PUSHOVER_USER_KEY and PUSHOVER_APP_TOKEN (commit by @JPar99)
• d6acfb1 - use dynamic version in User-Agent across all modules (commit by @JPar99)

♻️ Refactors

• 3db309a - reorder startup logs, add dev compose (commit by @JPar99)

🔧 Chores

• 0ab9042 - expand .dockerignore, restrict state file permissions (commit by @JPar99)
• c0a6471 - bump version to v2.2.1 (commit by @JPar99)
• 390c557 - Refined credits (commit by @JPar99)