Add periodic job for envoy and containerd (apache#503)

* Add support for config-gcc role

You can use below config to enbale gcc-7:
```
  roles:
    - role: config-gcc
      gcc_version: 7
```

Close-issue: theopenlab/openlab#239

* Add periodic job for envoy and containerd

This patch add the periodic jobs for envoy and containerd arm
build.

- containerd-build-arm64
- envoy-build-arm64

Author: Yikun

zuul.d/projects.yaml

@@ -80,6 +80,13 @@
         - helm-integration-test-kubeadm-k8s-v1.12.7:
             branches: master
 
+- project:
+    name: containerd/containerd
+    periodic-2/14:
+      jobs:
+        - containerd-build-arm64:
+            branches: master
+
 ####################### periodic jobs on 04:00/16:00 ##########################
 #- project:
 #    name: huaweicloud/openshift-ansible
@@ -125,6 +132,13 @@
         - cloud-provider-openstack-acceptance-test-e2e-conformance-stable-branch-v1.14:
             branches: release-1.14
 
+- project:
+    name: envoyproxy/envoy
+    periodic-4/16:
+      jobs:
+        - envoy-build-arm64:
+            branches: master
+
 ####################### periodic jobs on 06:00/18:00 ##########################
 - project:
     name: hashicorp/packer