Update GitHub actions to add a workflow dispatch option

Author: alessfg

.github/workflows/molecule.yml

@@ -11,6 +11,7 @@ on:
       - "*"
   schedule:
     - cron: "0 0 1 * *"
+  workflow_dispatch:
 jobs:
   molecule:
     name: Molecule

CHANGELOG.md

@@ -9,7 +9,8 @@ BREAKING CHANGES:
 
 ENHANCEMENTS:
 
-Replace Ansible base with Ansible core. Ansible core will be the "core" Ansible release moving forward from Ansible `2.11`.
+*   Replace Ansible base with Ansible core. Ansible core will be the "core" Ansible release moving forward from Ansible `2.11`.
+*   Update GitHub actions to add a workflow dispatch option.
 
 BUG FIXES: