Add CentOS 8 to the test matrix (#63649)

shippable.yml

@@ -86,6 +86,7 @@ matrix:
     - env: T=freebsd/12.0/1
     - env: T=linux/centos6/1
     - env: T=linux/centos7/1
+    - env: T=linux/centos8/1
     - env: T=linux/fedora30/1
     - env: T=linux/fedora31/1
     - env: T=linux/opensuse15py2/1
@@ -100,6 +101,7 @@ matrix:
     - env: T=freebsd/12.0/2
     - env: T=linux/centos6/2
     - env: T=linux/centos7/2
+    - env: T=linux/centos8/2
     - env: T=linux/fedora30/2
     - env: T=linux/fedora31/2
     - env: T=linux/opensuse15py2/2
@@ -114,6 +116,7 @@ matrix:
     - env: T=freebsd/12.0/3
     - env: T=linux/centos6/3
     - env: T=linux/centos7/3
+    - env: T=linux/centos8/3
     - env: T=linux/fedora30/3
     - env: T=linux/fedora31/3
     - env: T=linux/opensuse15py2/3
@@ -128,6 +131,7 @@ matrix:
     - env: T=freebsd/12.0/4
     - env: T=linux/centos6/4
     - env: T=linux/centos7/4
+    - env: T=linux/centos8/4
     - env: T=linux/fedora30/4
     - env: T=linux/fedora31/4
     - env: T=linux/opensuse15py2/4

test/lib/ansible_test/_data/completion/docker.txt

@@ -1,6 +1,7 @@
 default name=quay.io/ansible/default-test-container:1.10.1 python=3.6,2.6,2.7,3.5,3.7,3.8 seccomp=unconfined
 centos6 name=quay.io/ansible/centos6-test-container:1.8.0 python=2.6 seccomp=unconfined
 centos7 name=quay.io/ansible/centos7-test-container:1.8.0 python=2.7 seccomp=unconfined
+centos8 name=quay.io/ansible/centos8-test-container:1.10.0 python=3.6 seccomp=unconfined
 fedora30 name=quay.io/ansible/fedora30-test-container:1.9.2 python=3.7
 fedora31 name=quay.io/ansible/fedora31-test-container:1.11.0 python=3.7
 opensuse15py2 name=quay.io/ansible/opensuse15py2-test-container:1.8.0 python=2.7