S3Proxy 2.7.0

• Add latency blobstore middleware, #836
• Allow null localIdentity with bucket locators, #781
• Fix EncryptedBlobStore support for S3 compatible backends without ETag suffix, #825
• Force Jetty header cache to be case-sensitive, #837
• Ignore more new AWS checksum headers, #760, #765
• Remove armv7 Docker image, #826
• Return PRIVATE permissions for non-POSIX systems, #816
• Use dumb-init as init system for Docker image, #793

Thanks @lukaszherman, @musabshak, @Phantom-101, @polarctos, and @re1709 for opening pull requests to improve S3Proxy!