refactor(gate): refactor rtd trigger

This patch set uses the same mechanism as airship-deckhand to trigger
the readthedoc publish job in the post pipeline.

Change-Id: If750baebef23bf84c7ccf5d8e3ab6335f97bdfb6
Signed-off-by: Tin Lam <tin@irrational.io>

.zuul.yaml

@@ -107,14 +107,15 @@
 
 - job:
     name: airship-armada-doc-publish
-    timeout: 1800
-    run: tools/gate/playbooks/rtd-build-trigger.yaml
+    description: |
+      Publish documentation on airship-armada.readthedocs.io
+    run: tools/gate/playbooks/readthedocs.yaml
     nodeset: airship-armada-single-node
     secrets:
-      - rtd_credential
+      - airship_armada_rtd_credential
 
 - secret:
-    name: rtd_credential
+    name: airship_armada_rtd_credential
     data:
       id: !encrypted/pkcs1-oaep
         - CUGL2+J0WfXsx2xyJRWs9QJHkEMlJkILygoYwJNlhotRm67UDhD1XZINU99BUkdwhow8F

tools/gate/playbooks/readthedocs.yaml

@@ -17,6 +17,6 @@
     - name: Trigger RTD job
       uri:
         method: POST
-        body: 'token={{ rtd_credential.token }}'
-        url: 'https://readthedocs.org/api/v2/webhook/{{ zuul.project.short_name }}/{{ rtd_credential.id }}/'
+        body: 'token={{ airship_armada_rtd_credential.token }}'
+        url: 'https://readthedocs.org/api/v2/webhook/{{ zuul.project.short_name }}/{{ airship_armada_rtd_credential.id }}/'
         follow_redirects: all