app.sh

build() {
  docker-compose $BUILD_MODE build
}

Jenkinsfile

stage('Setup') {

        try {
          echo "pulling in master branch"
          git branch: '${BRANCH_NAME}', credentialsId: '3741f9e1-0a6c-41cb-981d-a0a5c1dcac6a', url: 'git@git.com:company/app.git'

          env.IMAGE_TAG='latest'

          sh """
            docker-compose -f docker/env.yml run --rm app php ./init --env=Production --overwrite=Yes
            npm install
            ./app.sh gulp less
            ./app.sh -b composer-install
          """
        } catch (error) {
          throw error
        }

      }
      

      stage('Build') {
        try {
          echo 'building docker image'
          sh './app.sh -b build'
          
          echo 'docker image built: tagging new image'
          sh "docker tag app/app:build app/app:${BRANCH_NAME}-${BUILD_NUMBER}"
          sh 'docker push app/app:build'
          
        } catch (error) {
          throw error
        }
      }