feat: add `output` option to set the export action for build results (#71)

_docs/_index.md

@@ -142,6 +142,9 @@ pull_image
 compress
 : enables compression og the build context using gzip
 
+output
+: sets output folder for build artifacts (format: `path` or `type=TYPE[,KEY=VALUE]`)
+
 repo
 : sets repository name for the image
 

cmd/drone-docker-buildx/config.go

@@ -150,6 +150,12 @@ func settingsFlags(settings *plugin.Settings) []cli.Flag {
 			Usage:       "enables suppression of the build output",
 			Destination: &settings.Build.Quiet,
 		},
+		&cli.StringFlag{
+			Name:        "output",
+			EnvVars:     []string{"PLUGIN_OUTPUT"},
+			Usage:       "sets build output folder",
+			Destination: &settings.Build.Output,
+		},
 		&cli.StringFlag{
 			Name:        "target",
 			EnvVars:     []string{"PLUGIN_TARGET"},

plugin/docker.go

@@ -84,7 +84,7 @@ func commandBuild(build Build, dryrun bool) *exec.Cmd {
 	}
 
 	args = append(args, build.Context)
-	if !dryrun && len(build.Tags.Value()) > 0 {
+	if !dryrun && build.Output == "" && len(build.Tags.Value()) > 0 {
 		args = append(args, "--push")
 	}
 	if build.Compress {
@@ -114,6 +114,9 @@ func commandBuild(build Build, dryrun bool) *exec.Cmd {
 	if build.Quiet {
 		args = append(args, "--quiet")
 	}
+	if build.Output != "" {
+		args = append(args, "--output", build.Output)
+	}
 
 	if len(build.Platforms.Value()) > 0 {
 		args = append(args, "--platform", strings.Join(build.Platforms.Value()[:], ","))

plugin/impl.go

@@ -59,6 +59,7 @@ type Build struct {
 	NoCache    bool            // Docker build no-cache
 	AddHost    cli.StringSlice // Docker build add-host
 	Quiet      bool            // Docker build quiet
+	Output     string          // Docker build output folder
 }
 
 // Settings for the Plugin.