Tileserver build deprecation

[davenquinn]

Apparently we are using a legacy pathway to install node

 => [tileserver  9/18] RUN curl -sL https://deb.nodesource.com/setup_14.x | bash - &&   apt-get install -y nodejs &&   rm -rf /var/lib/apt/lists/*                                      67.7s
 => => #                           SCRIPT DEPRECATION WARNING
 => => # ================================================================================
 => => # ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
 => => # ================================================================================
 => => # TO AVOID THIS WAIT MIGRATE THE SCRIPT
 => => # Continuing in 60 seconds (press Ctrl-C to abort) ...