Build CML image and launch runner is failing due to node_12.x

[DavidGOrtega]

#7 14.10 E: Failed to fetch https://deb.nodesource.com/node_12.x/dists/focal/main/binary-amd64/Packages.gz  File has unexpected size (20 != 767). Mirror sync in progress? [IP: 95.100.101.35 443]
#7 14.10    Hashes of expected file:
#7 14.10     - Filesize:767 [weak]
#7 14.10     - SHA256:6dab46c749a9483dee7762fdd1b1a73b147d510e417f4fb79f03a4322982f608
#7 14.10     - SHA1:c93512acda8e0a0a76909eb10c0821362c588f57 [weak]
#7 14.10     - MD5Sum:71aa3be969462f83830fb6333694054f [weak]
#7 14.10    Release file created at: Thu, 01 Jul 2021 16:40:55 +0000
#7 14.10 E: Some index files failed to download. They have been ignored, or old ones used instead.
#7 14.10 Error executing command, exiting
------
executor failed running [/bin/bash -c add-apt-repository ppa:git-core/ppa --yes  && add-apt-repository ppa:longsleep/golang-backports --yes  && curl --location https://deb.nodesource.com/setup_12.x | bash  && apt-get update  && apt-get install --yes git golang-go nodejs  && apt-get clean  && rm --recursive --force /var/lib/apt/lists/*]: exit code: 1
Davids-MacBook-Pro:cml davidgortega$ docker build -t cml_local -f ./Dockerfile .

[DavidGOrtega]

@casperdcl @0x2b3bfa0

[0x2b3bfa0]

• Solved with Packages file empty on Ubuntu 20.04  nodesource/distributions#1242
• Unrelated: should we update Node JS to 14 or higher? Drop support for Node.js 12 or use a transpiler #597