add build steps

pkg/tasks/build.go

@@ -1,10 +1,44 @@
 package tasks
 
-import "log"
+import (
+	"context"
+	"log"
 
-func Build(imageTag string) error {
+	"dagger.io/dagger"
+	"git.front.kjuulh.io/kjuulh/byg"
+	"git.front.kjuulh.io/kjuulh/dagger-go/internal"
+)
 
+func Build(builder *internal.Builder, imageTag string) error {
 	log.Printf("building image: %s", imageTag)
 
-	return nil
+	client := builder.Dagger
+	ctx := context.Background()
+
+	return byg.
+		New().
+		Step(
+			"build golang",
+			byg.Step{
+				Execute: func(_ byg.Context) error {
+					src, err := client.
+						Host().
+						Workdir().
+						Read().
+						ID(context.Background())
+					if err != nil {
+						return err
+					}
+
+					golang := client.Container().From("golang:latest")
+					golang = golang.WithMountedDirectory("/src", src).WithWorkdir("/src")
+					_, err = golang.Exec(dagger.ContainerExecOpts{
+						Args: []string{"go", "build", "-o", "build/"},
+					}).ExitCode(ctx)
+
+					return err
+				},
+			}).
+		Execute(context.Background())
+
 }