Update the docs building workflow for PPO (#521)

* Update the travis script

* update doc generate path

* revert test

* test

* test

* test

* test

* test

* Update script

* Pull from PPO develop branch to test

* Remove tmp print messages

* We don't need no, PYTHONIFICATION

* Fill small shell typo

scripts/deploy_docs_on_travis.sh

 #!/usr/bin/env bash
+exit_code=0
+if [[ "$TRAVIS_PULL_REQUEST" != "false" ]]; then exit $exit_code; fi;
 
-if [[ "$TRAVIS_PULL_REQUEST" != "false" ]]; then exit 0; fi;
-if [[ "$TRAVIS_BRANCH" != "develop" ]]; then exit 0; fi;
-export DEPLOY_DOCS_SH=https://raw.githubusercontent.com/PaddlePaddle/PaddlePaddle.org/master/scripts/deploy/deploy_docs.sh
-export DOCS_DIR=`pwd`
-cd ..
-curl $DEPLOY_DOCS_SH | bash -s $CONTENT_DEC_PASSWD $TRAVIS_BRANCH $DOCS_DIR
+if [ "$TRAVIS_BRANCH" == "develop_doc" ]; then
+    PPO_SCRIPT_BRANCH=develop
+elif [[ "$TRAVIS_BRANCH" == "develop" ]]; then
+    PPO_SCRIPT_BRANCH=master
+else
+    exit $exit_code;
+fi
+
+export DEPLOY_DOCS_SH=https://raw.githubusercontent.com/PaddlePaddle/PaddlePaddle.org/$PPO_SCRIPT_BRANCH/scripts/deploy/deploy_docs.sh
+
+docker run -it \
+    -e CONTENT_DEC_PASSWD=$CONTENT_DEC_PASSWD \
+    -e TRAVIS_BRANCH=$TRAVIS_BRANCH \
+    -e DEPLOY_DOCS_SH=$DEPLOY_DOCS_SH \
+    -e TRAVIS_PULL_REQUEST=$TRAVIS_PULL_REQUEST \
+    -e PPO_SCRIPT_BRANCH=$PPO_SCRIPT_BRANCH \
+    -e PADDLE_ROOT=/VisualDL \
+    -v "$PWD:/VisualDL" \
+    -w /VisualDL \
+    paddlepaddle/paddle:latest-dev \
+    /bin/bash -c 'curl $DEPLOY_DOCS_SH | bash -s $CONTENT_DEC_PASSWD $TRAVIS_BRANCH /VisualDL /VisualDL/build/doc/ $PPO_SCRIPT_BRANCH' || exit_code=$(( exit_code | $? ))