fix: remove unimplemented squash option (#52)

cmd/drone-docker-buildx/config.go

@@ -163,12 +163,6 @@ func settingsFlags(settings *plugin.Settings) []cli.Flag {
 			EnvVars:     []string{"PLUGIN_CACHE_FROM"},
 			Destination: &settings.Build.CacheFrom,
 		},
-		&cli.BoolFlag{
-			Name:        "squash",
-			Usage:       "squash the layers at build time",
-			EnvVars:     []string{"PLUGIN_SQUASH"},
-			Destination: &settings.Build.Squash,
-		},
 		&cli.BoolFlag{
 			Name:        "pull-image",
 			Usage:       "force pull base image at build time",

plugin/docker.go

@@ -87,9 +87,6 @@ func commandBuild(build Build, dryrun bool) *exec.Cmd {
 	if !dryrun {
 		args = append(args, "--push")
 	}
-	if build.Squash {
-		args = append(args, "--squash")
-	}
 	if build.Compress {
 		args = append(args, "--compress")
 	}

plugin/impl.go

@@ -52,7 +52,6 @@ type Build struct {
 	Args       cli.StringSlice // Docker build args
 	ArgsEnv    cli.StringSlice // Docker build args from env
 	Target     string          // Docker build target
-	Squash     bool            // Docker build squash
 	Pull       bool            // Docker build pull
 	CacheFrom  cli.StringSlice // Docker build cache-from
 	Compress   bool            // Docker build compress
@@ -155,11 +154,6 @@ func (p *Plugin) Execute() error {
 		fmt.Println("Registry credentials or Docker config not provided. Guest mode enabled.")
 	}
 
-	if p.settings.Build.Squash && !p.settings.Daemon.Experimental {
-		fmt.Println("Squash build flag is only available when Docker deamon is started with experimental flag. Ignoring...")
-		p.settings.Build.Squash = false
-	}
-
 	// add proxy build args
 	addProxyBuildArgs(&p.settings.Build)