Improve Docker installation management

[3alpha]

Docker is a crucial piece of a puzzle in DAppNode system so we need to take special care for its updates. Currently, there are two types of Docker installations in wild

• DAppNodes that have been deployed before Nov 9. 2022 have Docker installed from a .deb package
• More recent installations have Docker repo added to /etc/apt/sources.list.d

For context: #507

Work that needs to be done is following

• Docker repo needs to be added to the older DAppNode installs
• There has to be devised foolproof way of installing Docker updates taking into account that Docker is essential part of the whole DAppNode system and failed installation cannot be an option

It is worth to note that out of the abundance of caution, Docker updates are disabled through DAppManager frontend.