Arm GDB buildbot workers

[Christophe Lyon <christophe.lyon@arm.com>]

Hi,

As discussed on IRC we are going to enable workers on our Ampere "big"
machine.

For a start, we are going to try with GDB, having 4 different docker
containers on the machine covering ubuntu-20.04/ubuntu-22.04 x
arm64/armhf, using 4 CPUs each.

I am not sure if we need a single password for all workers, or 4 of them?

For each of them that means:
ncpus:4
maxcpus:4
max_builds:1

Once these work, I'll add more containers for glibc, binutils and
hopefully GCC.

I think this small patch is desirable:
diff --git a/builder/containers/bb-start.sh b/builder/containers/bb-start.sh
index 31cdbc9..220e82e 100755
--- a/builder/containers/bb-start.sh
+++ b/builder/containers/bb-start.sh
@@ -18,6 +18,7 @@ fi

  # Fill in the info visible in the buildbot website
  # objcopy gives us the binutils version, iconv the glibc version
+mkdir -p $worker_dir/info
  echo buildbot@sourceware.org > $worker_dir/info/admin
  echo $IMAGE_NAME > $worker_dir/info/host
  gcc --version | head -1 >> $worker_dir/info/host


Let me know if I missed something.

Thanks,

Christophe
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