Merge pull request #5184 from tsmolka/patch-1

builder/hyperv/iso: missing InterpolateContext

builder/hyperv/iso/builder.go

@@ -92,7 +92,8 @@ type Config struct {
 // Prepare processes the build configuration parameters.
 func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 	err := config.Decode(&b.config, &config.DecodeOpts{
-		Interpolate: true,
+		Interpolate:        true,
+		InterpolateContext: &b.config.ctx,
 		InterpolateFilter: &interpolate.RenderFilter{
 			Exclude: []string{
 				"boot_command",