v0.1.2 — bounded restart policy and master-key file fix

What's Changed

• fix(docker): bound Swarm restart attempts for leaf and caddy by @baxyz in #29
• fix(leaf): actually read BRIGID_MASTER_KEY_FILE by @baxyz in #30
• docs: changelog entry for v0.1.2 by @baxyz in #31

Full Changelog: v0.1.1...v0.1.2