v5.15.0

• copy: move error message to debug
• copy: drop FetchPartialBlobs option
• Use http.Method* constants instead of hard-coded strings
• Use http.NewRequestWithContext() instead of http.NewRequest().WithContext()
• Note that this module requires Go 1.13
• Don't unnecessarily strip schema:// and /path from registry on search
• Don't build a map just to access one element
• Prevent simultaneous compression and decompression
• refactoring per PR comments
• Add support for decompressing while copying to dir://
• build(deps): bump github.com/containers/storage from 1.32.6 to 1.33.0
• Return an actual error instead of nil when registry returns bad status code
• Reduce the dependency of pkg/compression on c/storage/pkg/chunked
• Update c/storage to v1.33.0
• Use pkg/compression/types where possible
• Add pkg/compression/types.*AlgorithmName constants
• Don't change InternalUnstableUndocumentedMIMEQuestionMark of Xz
• Fold the algorithm initializers
• Refer to compression.Gzip instead of looking it up by name
• Fix unpredictable outcome of compression.DetectCompression*
• Use quay.io in docker unit tests instead of docker.io
• Cirrus: Sync. skopeo test to skopeo repo.
• Remove GetCredentials deprecation