Document Vagrant being unsupported on CentOS 8 (#67)

Author: ssbarnea

README.rst

@@ -28,6 +28,24 @@ Molecule Vagrant Plugin
 Molecule Vagrant is designed to allow use of Vagrant for provisioning of test
 resources.
 
+Supported Platforms
+===================
+
+This driver relies on vagrant command line which is known to be problematic
+to install on several platforms. We do our best to perform CI/CD testing on
+multiple platforms but some are disabled due to known bugs.
+
+* ✅ MacOS with VirtualBox - GitHub Actions
+* ✅ Fedora 32 with libvirt - Zuul
+* ❌ CentOS 8 with libvirt - Zuul DISABLED due to 1127_ and 11020_
+
+Please **do not file bugs for unsupported platforms**. You are welcomed to
+create PRs that fix untested platform, as long they do not break existing ones.
+
+.. _`1127`: https://github.com/vagrant-libvirt/vagrant-libvirt/issues/1127
+.. _`11020`: https://github.com/hashicorp/vagrant/issues/11020
+
+
 Documentation
 =============
 

zuul.d/layout.yaml

@@ -11,25 +11,27 @@
       tox_envlist: py38
     timeout: 3600
 
-- job:
-    name: molecule-vagrant-centos
-    description: Run py36 tox environment
-    parent: ansible-tox-py36
-    nodeset: centos-8-1vcpu
-    attempts: 2
-    vars:
-      tox_envlist: py36
-    timeout: 3600
+# CentOS is unsupported due to:
+# https://github.com/vagrant-libvirt/vagrant-libvirt/issues/1127
+# - job:
+#     name: molecule-vagrant-centos
+#     description: Run py36 tox environment
+#     parent: ansible-tox-py36
+#     nodeset: centos-8-1vcpu
+#     attempts: 2
+#     vars:
+#       tox_envlist: py36
+#     timeout: 3600
 
-- job:
-    name: molecule-vagrant-devel-centos
-    description: Run devel tox environment
-    parent: ansible-tox-py36
-    nodeset: centos-8-1vcpu
-    attempts: 2
-    vars:
-      tox_envlist: devel
-    timeout: 3600
+# - job:
+#     name: molecule-vagrant-devel-centos
+#     description: Run devel tox environment
+#     parent: ansible-tox-py36
+#     nodeset: centos-8-1vcpu
+#     attempts: 2
+#     vars:
+#       tox_envlist: devel
+#     timeout: 3600
 
 - project:
     check:
@@ -38,8 +40,8 @@
             vars:
               test_setup_skip: true
               tox_envlist: lint,packaging
-        - molecule-vagrant-centos
+        # - molecule-vagrant-centos
         - molecule-vagrant-fedora
-        - molecule-vagrant-devel-centos
+        # - molecule-vagrant-devel-centos
     gate:
       jobs: *defaults