Define a generic Artifact object for now

pkg/compiler/artifact.go

@@ -15,4 +15,23 @@
 
 package compiler
 
-type Artifact struct{}
+type Artifact interface {
+	GetPath() string
+	SetPath(string)
+}
+
+type PackageArtifact struct {
+	Path string
+}
+
+func NewPackageArtifact(path string) Artifact {
+	return &PackageArtifact{Path: path}
+}
+
+func (a *PackageArtifact) GetPath() string {
+	return a.Path
+}
+
+func (a *PackageArtifact) SetPath(p string) {
+	a.Path = p
+}

pkg/compiler/compiler.go

@@ -41,7 +41,7 @@ func NewLuetCompiler(backend CompilerBackend, t pkg.Tree) Compiler {
 	}
 }
 
-func (cs *LuetCompiler) Compile(p CompilationSpec) (*Artifact, error) {
+func (cs *LuetCompiler) Compile(p CompilationSpec) (Artifact, error) {
 
 	// - If image is not set, we read a base_image. Then we will build one image from it to kick-off our build based
 	// on how we compute the resolvable tree.