Build fails due to deprecated set-env command

[miguelaferreira]

While using this action I got the following error message. It seems the action needs to be upgraded to comply with the new runner restrictions.

ssh-agent -a /tmp/ssh-auth.sock
SSH_AUTH_SOCK=/tmp/ssh-auth.sock; export SSH_AUTH_SOCK;
SSH_AGENT_PID=1673; export SSH_AGENT_PID;
echo Agent pid 1673;
Error: Unable to process command '::set-env name=SSH_AUTH_SOCK,::/tmp/ssh-auth.sock' successfully.
Error: The `set-env` command is disabled. Please upgrade to using Environment Files or opt into unsecure command execution by setting the `ACTIONS_ALLOW_UNSECURE_COMMANDS` environment variable to `true`. For more information see: https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
ssh-add /home/runner/.ssh/id_rsa
Identity added: /home/runner/.ssh/id_rsa (/home/runner/.ssh/id_rsa)