fix(entrypoint.sh): add commit.gpgsign

Author: Hendry, Adam

entrypoint.sh

@@ -20,6 +20,7 @@ if [[ $INPUT_GPG_SIGN == 'true' ]]; then
     exit 2
   fi
   echo "Configuring GPG for signing commits and tags..."
+  git config --local commit.gpgsign true
   git config --local user.signingkey "${INPUT_GIT_SIGNINGKEY}"
 fi