Fix cron test behavior

.travis.yml

@@ -8,7 +8,7 @@ services:
 
 jobs:
   include:    
-    - stage: test-pr
+    - stage: diff-test
       install:
       - pip install --upgrade pip
       - make dev-env
@@ -22,12 +22,22 @@ jobs:
       - make dev-env
       script: 
       - if [ $(make n-docs-diff DIFF_RANGE=$TRAVIS_COMMIT_RANGE) -ne 0 ]; then make tx-en; fi;
+    - stage: full-test
+      install:
+      - pip install --upgrade pip
+      - make dev-env
+      script:
+      - set -e
+      - make docs
+      - make build-test-all DARGS="--build-arg TEST_ONLY_BUILD=1"
 
 stages:
-    - name: test-pr
+    - name: diff-test
       if: type = pull_request
     - name: push-tx
       if: type = push AND branch = master
+    - name: full-test
+      if: type = cron AND branch = master
 
 env:
   global: