diff --git a/earthly/cddl/Earthfile b/earthly/cddl/Earthfile
new file mode 100644
index 000000000..9628d3c0d
--- /dev/null
+++ b/earthly/cddl/Earthfile
@@ -0,0 +1,8 @@
+VERSION 0.8
+
+# cspell: words cddlc
+
+cddl-base:
+    FROM ruby:3.3.0-alpine
+
+    RUN gem install cddlc
\ No newline at end of file