JET-2338: Add support for file scheme in dist URL #1
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Its a royal pain to have to get the flink-dist.tar.gz exposed via HTTP in order to do the docker build, so this change allows the generated Dockerfile to reference the tgz as a local file via
file:scheme.Note that this change also uses the
RUN --mount ...command in the Dockerfile which is not supported in older versions of docker. This mounts the build context dir (.) as/build-ctx, thus requiring the tgz file to be in the build context dir, and that the FLINK_TGZ_URL value must start withfile://build-ctx/