.travis.yml

sudo: required
language: bash
services: docker
# import note about external pull requests and travis:
#   https://docs.travis-ci.com/user/pull-requests/#Pull-Requests-and-Security-Restrictions
env:
 - IMAGE=ffmpeg VERSION=4.0 OS=alpine
 - IMAGE=ffmpeg VERSION=3.3 OS=alpine
 - IMAGE=ffmpeg VERSION=3.4 OS=alpine
 - IMAGE=ffmpeg VERSION=3.4.2 OS=alpine
 - IMAGE=ffmpeg VERSION=snapshot OS=alpine

before_script:
  - env | sort
  - IMAGE_VERSION="${IMAGE}:${VERSION}-${OS}"
  - echo "$IMAGE_VERSION"
  - LOCAL_DIR="${IMAGE}-${VERSION}-${OS}"
  - echo "$LOCAL_DIR"

script:
- docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
- docker build --build-arg VCS_REF=`git rev-parse --short HEAD` --build-arg BUILD_DATE=`date -u +”%Y-%m-%dT%H:%M:%SZ”` -t $DOCKER_USERNAME/$IMAGE:latest -t $DOCKER_USERNAME/$IMAGE_VERSION $LOCAL_DIR
- docker images
- echo "$DOCKER_USERNAME/$IMAGE_VERSION"
- docker run $DOCKER_USERNAME/$IMAGE_VERSION -version >"$LOCAL_DIR/README.md"  
- docker run $DOCKER_USERNAME/$IMAGE_VERSION -buildconf >>"$LOCAL_DIR/README.md"
- docker tag $DOCKER_USERNAME/$IMAGE:latest $DOCKER_USERNAME/$IMAGE_VERSION
# - if [[ "$VERSION" == "3.4" ]]; docker push $DOCKER_USERNAME/$IMAGE:latest ; fi
- if [ $VERSION == "4.0" ]; then
    docker push $DOCKER_USERNAME/$IMAGE:latest;
    fi
- docker push $DOCKER_USERNAME/$IMAGE_VERSION