Renaming Git `master` branches to `main` on Tuesday, May 11

[Benjamin Gilbert]

Hi all,

Next Tuesday, May 11, we'll be renaming the `master` branches of our Git
repos to `main`.  This change will affect the following repositories in the
GitHub `coreos` organization:

    afterburn, airlock, bootupd, console-login-helper-messages,
    coreos-assembler, coreos-ci, coreos-ci-lib, coreos-installer,
    enhancements, fcos-pinger-backend, fedora-coreos-browser,
    fedora-coreos-cincinnati, fedora-coreos-docs, fedora-coreos-pinger,
    fedora-coreos-pipeline, fedora-coreos-releng-automation,
    fedora-coreos-stream-generator, fedora-coreos-streams,
    fedora-coreos-tracker, go-semver, go-systemd, ign-converter,
    ignition, openssh-keys, rpm-ostree, ssh-key-dir, vcontext, zincati

It will also affect these additional GitHub repos:

    ostreedev/ostree, ostreedev/ostree-go

After the rename, local checkouts of these repos will need to be updated.
Run the following commands within your local copy:

    git branch -m master main
    git fetch -p origin
    git branch -u origin/main main
    git remote set-head origin -a

Finally, the following Quay repos will gain a `main` tag and lose a
`master` tag.  The `latest` and `release` tags will not be affected.

    coreos/coreos-installer, coreos/ignition-validate,
    coreos-assembler/coreos-assembler

If you encounter any issues due to the rename, please let us know in
#fedora-coreos on Freenode.

Best,
--Benjamin Gilbert