fix: use environment file to manage outputs

drawio-export.sh

@@ -46,7 +46,7 @@ if [ "${INPUT_ACTION_MODE}" != "all" ]; then
  # but 'actions/checkout' make a shallow clone by default
  if [ "$(git rev-parse --is-shallow-repository)" == "true" ]; then
  error_message="This is a shallow git repository."
- echo "::set-output name=error_message::${error_message}"
+ echo "error_message=${error_message}" >>"$GITHUB_OUTPUT"
  echo "::error ::${error_message}"
  echo "Add 'fetch-depth: 0' to 'actions/checkout' step to use the '${INPUT_ACTION_MODE}' mode."
  exit 1
@@ -116,7 +116,7 @@ echo "::debug::< error message : ${error_message}"
 # Try to calculate the correct reference to use
 echo "::debug::Calculating reference to use"
 if [ "${action_mode}" == "none" ]; then
- echo "::set-output name=error_message::${error_message}"
+ echo "error_message=${error_message}" >>"$GITHUB_OUTPUT"
  echo "::error ::${error_message}"
  echo "::error ::The choosen action mode '${INPUT_ACTION_MODE}' can't be used. Consider switching to 'auto' (default value)."
  exit 1