Proposal: Add build --compression flag

[vvoland]

Description

Add --compression flag as a shorthand for: -o type=image,compression=<X>

Examples

-docker build -t asdf -o type=image,compression=zstd
+docker build -t asdf --compression zstd

-docker build -t asdf -o type=image,compression=uncompressed
+docker build -t asdf --compression uncompressed

Further enhancements

Also supportcompression-level

-docker build -t asdf -o type=image,compression=zstd,compression-level=1
+docker build -t asdf --compression zstd:1

Shorthand for uncompressed value

Optionally, provide none/false value as a shorthand for uncompressed:

-docker build -t asdf -o type=image,compression=uncompressed
+docker build -t asdf --compression none

Short flag

-c/--compressed

-docker build -t asdf -o type=image,compression=uncompressed
+docker build -t asdf -c none

[tonistiigi]

Note that -o is an array of outputs

Edit: Reading again it looks like you are suggesting not modifying -o but inserting. In that case, outputs like oci, docker also create images.