GH-245: Fix jelly-text serialization in AoT builds

Add regression test

Author: Ostrzyciel

.github/workflows/aot-test.yml

@@ -70,6 +70,11 @@ jobs:
           # Test rdf validate
           target/graalvm-native-image/jelly-cli \
             rdf validate out.jelly --compare-to-rdf-file in.nt
+          
+          # Test conversion to Jelly-text (requires ProtobufFeature)
+          target/graalvm-native-image/jelly-cli \
+            rdf from-jelly --out-format=jelly-text out.jelly > out.jellytxt && \
+            [ -s out.jellytxt ]
 
       - name: Upload binary
         uses: actions/upload-artifact@v4