v0.4.2

Notable Changes

• bake: fix parsing json config with hcl v2 #280
• bake: update go-cty to pull in more stdlib funcs #277
• bake: ensure --builder is wired from root options #321
• build: support cacheonly exporter #337
• build: improve error checking on load #281
• build: remove warning for multi-platform iidfile #351