fix(buildah): support Dockerfile builder target param to build specif…

…ic stage

Signed-off-by: Timofey Kirillov <timofey.kirillov@flant.com>

pkg/buildah/common.go

@@ -41,6 +41,7 @@ type BuildFromDockerfileOpts struct {
 	CommonOpts
 	ContextTar io.Reader
 	BuildArgs  map[string]string
+	Target     string
 }
 
 type RunMount struct {

pkg/buildah/native_linux.go

@@ -167,6 +167,7 @@ func (b *NativeBuildah) BuildFromDockerfile(ctx context.Context, dockerfile []by
 		SignaturePolicyPath: b.SignaturePolicyPath,
 		SystemContext:       &b.DefaultSystemContext,
 		Args:                opts.BuildArgs,
+		Target:              opts.Target,
 	}
 
 	errLog := &bytes.Buffer{}

pkg/container_runtime/buildah_runtime.go

@@ -91,6 +91,7 @@ func (runtime *BuildahRuntime) BuildDockerfile(ctx context.Context, dockerfile [
 		},
 		ContextTar: opts.ContextTar,
 		BuildArgs:  buildArgs,
+		Target:     opts.Target,
 	})
 }