added staging build step to docs deployment (#4129)

.circleci/config.yml

@@ -381,6 +381,12 @@ workflows:
             tags:
               only:
                 - /^v.*/
+      - deploy_docs:
+          context: tendermint-docs-staging
+          filters:
+            branches:
+              only:
+                - docs-theme-latest
       - setup_dependencies
       - test_abci_apps:
           requires:

Makefile

@@ -162,6 +162,7 @@ build-docs:
 		(git checkout $${p} && npm install && VUEPRESS_BASE="/$${p}/" npm run build) ; \
 		mkdir -p ~/output/$${p} ; \
 		cp -r .vuepress/dist/* ~/output/$${p}/ ; \
+		cp ~/output/$${p}/index.html ~/output ; \
 	done < versions ;
 
 sync-docs: