Remove hacky and frankly embarassing role usage pattern

playbooks/configure.yaml

@@ -16,13 +16,17 @@
     - include_tasks: tasks/meta/bootstrap-remote-env.yaml
 
 
-- name: Configure hosts by role
-  hosts: linux
+# "server", here, is a word used to mean "not a workstation"
+- name: Configure servers
+  hosts: linux:!workstation
   gather_facts: false
   roles:
     - role: server
-      when: "'server' in skylab_roles | default([])"
+
+
+- name: Configure cluster
+  hosts: linux:&cluster
+  gather_facts: false
+  roles:
     - role: datastore
-      when: "'datastore' in skylab_roles | default([])"
     - role: swarm
-      when: "'swarm' in skylab_roles | default([])"

playbooks/node-up.yaml

@@ -7,7 +7,6 @@
       private: true
   roles:
     - role: datastore
-      when: "'datastore' in skylab_roles | default([])"
   tasks:
     - name: Fetch node swarm ID
       ansible.builtin.command: