Revert "fix(entrypoint.sh): add gpg.program"

This reverts commit 94d316f.

Author: Hendry, Adam

entrypoint.sh

@@ -20,11 +20,9 @@ if [[ $INPUT_GPG_SIGN == 'true' ]]; then
     exit 2
   fi
   echo "Configuring GPG for signing commits and tags..."
-  git config --local gpg.program gpg
   git config --local commit.gpgsign true
   git config --local tag.gpgsign true
   git config --local user.signingkey "${INPUT_GIT_SIGNINGKEY}"
-  echo "Git GPG program: $(git config --get gpg.program)"
   echo "Git sign commits?: $(git config --get commit.gpgsign)"
   echo "Git sign tags?: $(git config --get tag.gpgsign)"
 fi