Tohuwabohu excorcism

phases:
  install:
    runtime-versions:
        java: openjdk11

    commands:
    - |
      cat > test-multi-lines-text << EOF
      line 1
      line 2
      EOF

    - cat test-multi-lines-text
    - 

To switch role use the sts asume role

Those are commands which can be used

      - ASSUME_ROLE_OUTPUT=$(aws sts assume-role --role-arn "arn:aws:iam::$TARGET_ACCOUNT:role/${PROJECT_NAME}-YOURTARGETCodeBuildRole" --role-session-name "session1" --query "Credentials" --output text)
      - export AWS_ACCESS_KEY_ID=$(echo $ASSUME_ROLE_OUTPUT | awk '{print $1}')
      - export AWS_SECRET_ACCESS_KEY=$(echo $ASSUME_ROLE_OUTPUT | awk '{print $3}')
      - export AWS_SESSION_TOKEN=$(echo $ASSUME_ROLE_OUTPUT | awk '{print $4}')
      - export AWS_DEFAULT_REGION=$REGION

Use http://www.yamllint.com/