Refactor roles to support new variable schema

Add common-env and docker roles

roles/packages/tasks/clean.yml

@@ -2,13 +2,13 @@
 - name: Clean DNF cache
   become: true
   when: ansible_distribution == "Fedora" or (ansible_distribution == "CentOS" and ansible_distribution_major_version == "8")
-  shell:
-    cmd: dnf clean all
+  command:
+    cmd: /usr/bin/dnf clean all
     warn: false
 
 - name: Clean YUM cache
   become: true
   when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7"
-  shell:
-    cmd: yum clean all
+  command:
+    cmd: /usr/bin/yum clean all
     warn: false