Use rockylinux, but allow overriding to i.e. centos.

README.md

@@ -98,9 +98,15 @@ exceptions:
 
 This optional file describes how Travis, Tox and Molecule should behave.
 
+|parameter       |type           |default|description|
+|----------------|---------------|-------|-----------|
+|tox_version     |list of strings|not set|What versions should Tox test? (Default: all.)|
+|enterprise_linux|string         |not set|If `EL` is used in `meta/main.yml` where should tests happen on? (Default: `rockylinux`.)
+
+
 ```yaml
 ---
-travis_parallel: no
 tox_versions:
   - current
+enterprise_linx: centos
 ```

vars/main.yml

@@ -26,7 +26,7 @@ platform_image_mapping:
   Amazon: amazonlinux
   Archlinux: archlinux
   Debian: debian
-  EL: centos
+  EL: "{{ enterprise_linux | default('rockylinux') }}"
   Fedora: fedora
   OpenSUSE: opensuse
   Ubuntu: ubuntu
@@ -57,7 +57,6 @@ distribution_version_mapping:
       - bullseye
   EL:
     all:
-      - 7
       - latest
     7:
       - 7