Setup-miniconda: The `add-path` command and `set-env` command is disabled

SOLUTION: Simply update your goanpeca/setup-miniconda@v1 hook to conda-incubator/setup-miniconda@v2 and the error should go away.

It looks like something changed to Github Actions today, as our setup-miniconda hook is breaking with the following error:

Add "/usr/share/miniconda/condabin" to PATH
Error: Unable to process command '::add-path::/usr/share/miniconda/condabin' successfully.
Error: The `add-path` 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/
/usr/share/miniconda/condabin/conda config --add pkgs_dirs /home/runner/conda_pkgs_dir
Error: Unable to process command '::set-env name=CONDA_PKGS_DIR::/home/runner/conda_pkgs_dir' 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/

See our error in more detail here.

And the workflow code here.

I found that this is affecting other hooks, so I imagine it must be a Github Actions change. E.g., https://github.com/djjudas21/camerahub/issues/630, https://github.com/apache/incubator-tvm/issues/6925.

EDIT: Actually it looks like GA announced this back in October, but went into effect today.