Add support for compression mode

[pditommaso]

This PR adds support for compression to container build requests.

[pditommaso]

It should be considered to add the compression to the containerId function to force a re-build when changing the compression mode

wave/src/main/groovy/io/seqera/wave/util/ContainerHelper.groovy

Lines 306 to 312 in b078ae0

	final attrs = new LinkedHashMap<String,String>(10)
	attrs.containerFile = containerFile
	attrs.condaFile = condaFile
	attrs.platform = platform?.toString()
	attrs.repository = repository
	if( buildContext ) attrs.buildContext = buildContext.tarDigest
	return RegHelper.sipHash(attrs)