refactor: run travis in parallel for expo cli v2 and v3

.travis.yml

@@ -5,17 +5,31 @@ services:
 env:
   global:
     - DOCKER_IMAGE=bycedric/expo-cli
-    - DOCKER_TAG=2
-script:
-  - docker build base -t $DOCKER_IMAGE:$DOCKER_TAG
-  - docker run -ti --rm $DOCKER_IMAGE:$DOCKER_TAG diagnostics
-  - docker build . -t expo/expo-github-action
-  - docker run -ti --rm expo/expo-github-action diagnostics
-before_deploy:
-  - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
-  - docker tag $DOCKER_IMAGE:$DOCKER_TAG $DOCKER_IMAGE:latest
-deploy:
-  provider: script
-  script: docker push $DOCKER_IMAGE:$DOCKER_TAG && docker push $DOCKER_IMAGE:latest
-  on:
-    branch: master
+stages:
+  - expo cli v3
+  - expo cli v2
+jobs:
+  include:
+    - stage: expo cli v3
+      script:
+        - docker build base/3 -t $DOCKER_IMAGE:3
+        - docker run -ti --rm $DOCKER_IMAGE:3 diagnostics
+      before_deploy:
+        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+        - docker tag $DOCKER_IMAGE:3 $DOCKER_IMAGE:latest
+      deploy:
+        provider: script
+        script: docker push $DOCKER_IMAGE:3 && docker push $DOCKER_IMAGE:latest
+        on:
+          branch: master
+    - stage: expo cli v2
+      script:
+        - docker build base/2 -t $DOCKER_IMAGE:2
+        - docker run -ti --rm $DOCKER_IMAGE:2 diagnostics
+      before_deploy:
+        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+      deploy:
+        provider: script
+        script: docker push $DOCKER_IMAGE:2
+        on:
+          branch: master