update travis build

.travis.yml

@@ -1,3 +1,7 @@
+language: bash
+
+os: linux
+
 services:
   - docker
 
@@ -34,29 +38,4 @@ script:
       docker tag $TARGET_IMAGE:$TARGET_IMAGE_TAG $TARGET_IMAGE:$ALT_IMAGE_TAG;
       docker push $TARGET_IMAGE:$ALT_IMAGE_TAG;
     fi
-
-jobs:
-  include:
-    - stage: manifest
-      script:
-        # update docker to edge
-        - sudo apt update -y
-        - sudo apt install --only-upgrade docker-ce -y
-        
-        # enable experimental to use docker manifest command
-        - mkdir $HOME/.docker
-        - |-
-          echo '{"experimental": "enabled"}' | tee $HOME/.docker/config.json
-        - |-
-          echo '{"experimental": true,"storage-driver": "overlay2","max-concurrent-downloads": 50,"max-concurrent-uploads": 50}' | sudo tee /etc/docker/daemon.json
-        - sudo service docker restart
-
-        # login
-        - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
-        
-        # main
-        - export MANIFEST_SUFFIX=$(if [ "$TRAVIS_BRANCH" = "master" ]; then echo "latest"; else echo "$TRAVIS_BRANCH"; fi)
-        - export TAG_PREFIX=$(if [ "$TRAVIS_BRANCH" = "master" ]; then echo ""; else echo "$TRAVIS_BRANCH-"; fi)
-        - docker manifest create $TARGET_IMAGE:$MANIFEST_SUFFIX $TARGET_IMAGE:${TAG_PREFIX}amd64 $TARGET_IMAGE:${TAG_PREFIX}arm32v5
-        - docker manifest annotate $TARGET_IMAGE:$MANIFEST_SUFFIX $TARGET_IMAGE:${TAG_PREFIX}arm32v5 --os=linux --arch=arm --variant=v5
-        - docker manifest push $TARGET_IMAGE:$MANIFEST_SUFFIX
+