This expects the `GPGKEY` and `PRIVGPGKEY` secrets to be set in the
respective GitHub repository.
The `GPGKEY` value should be of the form
<short-key> --passphrase <pass> --yes --batch --no-tty --pinentry-mode loopback --digest-algo SHA256
and the `PRIVGPGKEY` should be generated via
gpg --export-secret-keys | base64 | tr '\n' %
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Git for Windows uses MSYS2 as base system, and therefore the Git
binaries are bundled as Pacman package.
This workflow allows building the 64-bit version of this package (which
is called `mingw-w64-x86_64-git`).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>