cleanup Earthfiles, add cddl-check target

Author: Mr-Leshiy

Earthfile

@@ -41,17 +41,3 @@ repo-docs:
     COPY --dir *.md LICENSE-APACHE LICENSE-MIT .
 
     SAVE ARTIFACT /repo repo
-
-cddlc:
-    FROM ruby:3.3.0-alpine
-
-    WORKDIR /cddl
-
-    RUN gem install cddlc
-
-    COPY ./docs/src/architecture/08_concepts/catalyst_voting/cddl/gen_vote_tx.cddl .
-    COPY ./docs/src/architecture/08_concepts/catalyst_voting/cddl/vote_tx_v2.cddl .
-
-    RUN cddlc -u2tcddl vote_tx_v2.cddl
-
-    

docs/src/architecture/08_concepts/catalyst_voting/cddl/Earthfile

@@ -0,0 +1,13 @@
+VERSION 0.8
+
+IMPORT github.com/input-output-hk/catalyst-ci/earthly/cddl:feat/cddl AS cddl-ci
+
+check-cddl:
+    FROM cddl-ci+cddl-base
+
+    WORKDIR /cddl
+
+    COPY ./docs/src/architecture/08_concepts/catalyst_voting/cddl/gen_vote_tx.cddl .
+    COPY ./docs/src/architecture/08_concepts/catalyst_voting/cddl/vote_tx_v2.cddl .
+
+    RUN --no-cache cddlc -2tcddl vote_tx_v2.cddl