feat: add getter for krmt build directory (#1106)

* feat:adds a getter for build directory for the blueprint test

* Update infra/blueprint-test/pkg/krmt/krm.go

Co-authored-by: Bharath KKB <bharathkrishnakb@gmail.com>

* moving GetBuildDir with other methods

* Update infra/blueprint-test/pkg/krmt/krm.go

Co-authored-by: Awais Malik <awmalik@google.com>
Co-authored-by: Bharath KKB <bharathkrishnakb@gmail.com>

infra/blueprint-test/pkg/krmt/krm.go

@@ -352,3 +352,12 @@ func (b *KRMBlueprintTest) Test() {
 	utils.RunStage("apply", func() { b.Apply(a) })
 	utils.RunStage("verify", func() { b.Verify(a) })
 }
+
+// GetBuildDir returns the temporary build dir created for hydrating config. Defaults to .build/test-name.
+func (b *KRMBlueprintTest) GetBuildDir() string {
+	if b.buildDir == "" {
+		b.t.Fatalf("unable to get a valid build directory")
+	}
+
+	return b.buildDir
+}