LRZ Sync+Share client installation via APT for Debian/Ubuntu/Mint

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| Setup |
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Instructions:
 1) Copy public key file 'lrz-sasrepo-signing-gpg-key-g1.asc' to '/etc/apt/trusted.gpg.d':
      'curl -fsSL https://sasrepo.nas.lrz.de/lrz-sasrepo-signing-gpg-key-g1.asc | sudo tee /etc/apt/trusted.gpg.d/lrz-sasrepo-signing-gpg-key-g1.asc'
 2) Create the package source configuration file 'lrz-syncandshare.list' under '/etc/apt/sources.list.d':
      'echo "deb [arch=amd64] https://deb.sasrepo.nas.lrz.de/stable stable main #LRZ Sync+Share" | sudo tee /etc/apt/sources.list.d/lrz-syncandshare.list'
 3) Choose your favorite branch 'stable' (default) or 'testing'.
 4) Run 'sudo apt-get update'.
 5) To install LRZ Sync+Share client: 'sudo apt install lrz-sync-share'

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| Note |
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Available branches to choose in 'lrz-syncandshare.list':
 * 'stable': contains the recommended up-to-date client version (default)
 * 'testing': contains the latest available client build (for enthusiasts)

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| Last modified |
=================
LRZ Sync+Share Team
2023-12-07

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| Support / Feedback |
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LRZ Servicedesk:
 * https://servicedesk.lrz.de/ql/create/106