update drone config

.drone.yml

@@ -52,6 +52,40 @@ trigger:
 depends_on:
 - linting
 
+---
+kind: pipeline
+name: testing-centos8
+
+platform:
+  os: linux
+  arch: amd64
+
+concurrency:
+  limit: 1
+
+workspace:
+  base: /drone/src
+  path: ${DRONE_REPO_NAME}
+
+steps:
+- name: ansible-molecule
+  image: xoxys/molecule:3
+  commands:
+  - molecule test -scentos8
+  environment:
+    DO_API_KEY:
+      from_secret: do_api_key
+    MOLECULE_CUSTOM_FILTERS_REPO: https://gitea.rknet.org/ansible/custom_filters
+    MOLECULE_CUSTOM_MODULES_REPO: https://gitea.rknet.org/ansible/custom_modules
+
+trigger:
+  ref:
+  - refs/heads/master
+  - refs/tags/**
+
+depends_on:
+- linting
+
 ---
 kind: pipeline
 name: documentation
@@ -107,6 +141,7 @@ trigger:
 
 depends_on:
 - testing-centos7
+- testing-centos8
 
 ---
 kind: pipeline
@@ -146,6 +181,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: c3eb21e904a1ceed464b6d86c674b7c0b6569ba1787b20cc716269ba7baf01b8
+hmac: f615aca12417b414015aa553be03a857737a82bdda0772d02674fbd6cf7f5e1b
 
 ...