The Dockerfile is using linux/arm64 without the /v8 suffix.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

Use ..code-block:: syntax highlighting instead of :: so all bash
commands use the same syntax highlighting.

Signed-off-by: Leonard Anderweit <l.anderweit@phytec.de>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>

Remove double :: before .. code-block:: bash to correctly highlight the
following commands.

Signed-off-by: Leonard Anderweit <l.anderweit@phytec.de>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>

First, try and be slightly clearer about what "buildx" is with respect
to the docker build process.

Second, now that we build the container for both amd64 and arm64, we
should document how to make a docker "builder" that has multiple nodes.
With this one node should be amd64 and one node arm64, and with
reasonably fast arm64 hardware this will be much quicker than using
QEMU.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Add instructions on how to build the file for multiple architectures.
Add a message indicating what is happening.

Update the documentation as well.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

commit cacc0b2678c0 ("CI: Move to latest container image") updated the
docker container image.

Reflect the change in the documentation.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>

Integrate the Dockerfile from
https://source.denx.de/u-boot/gitlab-ci-runner.git as of
commit bc6130d572f1 ("Dockerfile: Remove high UID/GID") and introduce a
short rST on how to build the container.

Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>