To anyone who gets this error:
Error response from daemon: Dockerfile parse error line 7: unknown instruction: HTTP://DL.BINTRAY.COM/S
BT/DEBIAN/SBT-$SBT_VERSION.DEBMake sure that the curl command:
curl -L -o sbt-$SBT_VERSION.deb http://dl.bintray.com/sbt/debian/sbt-$SBT_VERSION.deb && \is all on one line.
