v2.1.5

• 13eb94a Update version to 2.1.5
• 672f125 Use rustls for reqwest to fix musl Docker build
• 4415b6a Fix CI: spelling, network test isolation, and Docker toolchain
• 8b4cc0c Fix request-path panics in storage and image handling
• 1e498e6 Add configurable image decode size limits
• 8092247 Add SSRF guard for attacker-supplied upstream hosts
• 3e39325 Fix path traversal in local storage backend
• 3568ad5 Add bucket-origin mode for S3 storage backend
• 6fe5e24 Fix cspell words
• 8a3925f Add logics for using S3 as backend