Add support for arm64 builds

[semihalf-mazur-hubert]

Allow building Rocket.Chat for arm64 platform. Changes made to the Dockerfile:

• Changed base image to provide a higher version of glibc.
• Check architecture compliance and store the result in env variable.
• Build some packages from sources as they do not provide arm64 versions. Build tested on x86 and arm64.

[CLAassistant]

All committers have signed the CLA.

[productiveme]

This is great, can confirm it solves my issue to deploy to Arm64

[snadampal]

any timeline for getting the aarch64 images onto docker hub?

[Molkobain]

Any feedback from the team would be great :)