Consider support for sqlpackage / .dacpac

[tracker1]

Note to self, on top of mssql-tools image, add sqlpackage (it's being refactored, but for now use legacy image. Should happen after #1 as it will likely build on that support

RUN apt-get update \
    && apt-get install -y unzip

# Install SQLPackage for Linux and make it executable
RUN wget --progress=bar:force -q \
    -O sqlpackage.zip \
    https://go.microsoft.com/fwlink/?linkid=2113331 \
    && unzip -qq sqlpackage.zip -d /opt/sqlpackage \
    && chmod +x /opt/sqlpackage/sqlpackage