Cannot "build without cache" when `imageName` is specified

[sarisia]

I want to build devcontainer image without using previous built image as a cache in order to
pull upstream image's updates, but specifiying imageName implies cacheFrom and seems
there's no way to disable this.

ci/github-action/src/main.ts

Lines 70 to 78 in 96af31b

	if (fullImageName) {
	if (!cacheFrom.includes(fullImageName)) {
	// If the cacheFrom options don't include the fullImageName, add it here
	// This ensures that when building a PR where the image specified in the action
	// isn't included in devcontainer.json (or docker-compose.yml), the action still
	// resolves a previous image for the tag as a layer cache (if pushed to a registry)
	core.info(`Adding --cache-from ${fullImageName} to build args`);
	cacheFrom.splice(0, 0, fullImageName);
	}

[stuartleeks]

Hi Takakazu Fu (@sarisia) - I believe this should be resolved by #199 which adds a noCache option to opt out of image caching