CI with github actions

[fxi]

Since the use of a aarch platform for development, all the builds for electron and packer have been put on hold.

A solution is to convert all tests and build steps into GitHub action.

• [x] Buildx automatic docker image building + push. [note, current version are tagged ci. Base image is build locally, as it's too slow to build as GitHub actions ]
• [x] Test runner
• [x] Packer (VirtualBox VM) + docker
• [x] Electron mac, linux, windows

It's a consequent job, but it's required by the issue #414 or any further changes.

[fxi]

Huge work to make that work... 160 commits 165 files changed, 9924 insertions(+), 4636 deletions(-)

This workflow should:

• Build and test AccessMod Images (AccessMod Docker)

If tests pass and working on the branch "release", automatically:

• Build a VM from scratch: disk, partition formatting, SSH and user configuration, install Alpine Linux
• Unattended provisioning: install and compile all dependencies for Alpine
• Build a ready-to-use OVA appliance (AccessMod VirtualBox, x86 only)
• Build Electron-based app (AccessMod Desktop)
  • Linux: deb package
  • macOS: dmg + notarized and signed app for x86 and ARM64 architecture
  • Windows: NSIS installer
• Wrap up a GitHub release