cmd: fix possible skipped defers for build and bake

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

util/cobrautil/error.go

@@ -0,0 +1,15 @@
+package cobrautil
+
+import (
+	"fmt"
+)
+
+type ExitCodeError int
+
+func (e ExitCodeError) Error() string {
+	return fmt.Sprintf("exiting with code %d", int(e))
+}
+
+func (e ExitCodeError) Unwrap() error {
+	return nil
+}