redirect proprocessed data to separate hex file in release script

release.sh

@@ -1,5 +1,5 @@
 IN=integration/outputs/e2e_tests
-OUT=release-v0.12.0-rc.1
+OUT=release-v0.12.0-rc.2
 
 mkdir -p $OUT
 
@@ -17,6 +17,10 @@ cp $IN/evm_verifier.yul $OUT/evm_verifier.yul
 cp $IN/pi_bundle_recursion.data $OUT/pi.data
 cp $IN/proof_bundle_recursion.data $OUT/proof.data
 
+# dump the preprocessed digest into a separate hex file.
+# preprocessed digest is the first 32 bytes of the public input.
+xxd -l 32 -p $OUT/pi.data | tr -d '\n' | awk '{gsub("%", ""); print}' > $OUT/preprocessed_digest.hex
+
 # copy config values for each proving layer
 cp ./integration/configs/* $OUT