Add OpenLab CI configuration

This patch adds the OpenLab CI configuration to enable
the support for arm build in OpenLab.

After this, each pull request in containerd will trigger the
containerd-arm64-build job which verified the arm build
on OpenLab ARM cluster.

Related: https://github.com/containerd/containerd/issues/2901

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

.zuul.yaml

@@ -0,0 +1,14 @@
+- project:
+    name: containerd/containerd
+    check:
+      jobs:
+        - containerd-build-arm64
+
+- job:
+    name: containerd-build-arm64
+    parent: init-test
+    description: |
+      Containerd build in openlab cluster.
+    run: .zuul/playbooks/containerd-build/run.yaml
+    nodeset: ubuntu-xenial-arm64
+    voting: false

.zuul/playbooks/containerd-build/run.yaml

@@ -0,0 +1,20 @@
+- hosts: all
+  become: yes
+  roles:
+    - role: config-golang
+      arch: arm64
+  tasks:
+    - name: Build containerd
+      shell:
+        cmd: |
+          set -xe
+          apt-get update
+          apt-get install -y btrfs-tools libseccomp-dev git pkg-config
+
+          make | tee $LOGS_PATH/make.txt
+          make test | tee $LOGS_PATH/make_test.txt
+
+          cp -r ./bin $RESULTS_PATH
+        chdir: '{{ zuul.project.src_dir }}'
+        executable: /bin/bash
+      environment: '{{ global_env }}'