ansible: dynamically exclude jenkins-workspace (#3816)

The `ansible/playbooks/jenkins/worker/create.yml` playbook runs some
tasks at the end to remove Node.js and check there is no runnable
`node` in the path. This is done on all `test` and `release` machines
with the exception of the `jenkins-workspace` machines, which need a
runnable `node` to run the linters.

Previously each `jenkins-workspace` machine was listed as an exclusion
to `hosts`. This PR moves the exclusion into the tasks and checks if
the host has an alias that begins `jenkins-workspace` (as all of our
`jenkins-workspace` machines are defined). This will avoid one place
that we have to remember to manually update every time we add/remove
a `jenkins-workspace` machine.

Author: richardlau

ansible/playbooks/jenkins/worker/create.yml

@@ -86,9 +86,6 @@
 - hosts:
   - test
   - release
-  - "!test-equinix-ubuntu2204-x64-1"
-  - "!test-equinix-ubuntu2204-x64-2"
-  - "!test-ibm-ubuntu2204-x64-3"
   tasks:
     - name: remove node and npm packages
       when:
@@ -97,20 +94,25 @@
       - not os|startswith("win")
       - not os|startswith("zos")
       - os != "macos11.0"
+      - not (alias is defined and alias is match('jenkins-workspace.*'))
       package:
         name: "{{ package }}"
         state: absent
       loop_control:
         loop_var: package
       with_items: [ "node", "nodejs", "npm" ]
     - name: fail if node is in the path - please uninstall it
-      when: not os|startswith("win")
+      when:
+      - not os|startswith("win")
+      - not (alias is defined and alias is match('jenkins-workspace.*'))
       shell: "node -v"
       register: node_check_cmd
       failed_when: node_check_cmd.rc == 0
       changed_when: False
     - name: fail if node is in the path - please uninstall it
-      when: os|startswith("win")
+      when:
+      - os|startswith("win")
+      - not (alias is defined and alias is match('jenkins-workspace.*'))
       win_shell: "node -v"
       register: node_check_cmd_win
       failed_when: node_check_cmd_win.rc == 0