Create Docker image for testing

[OleksandrKucherenko]

It will be great to implement a Docker image with the installed Obsidian and local REST extension enabled.

It will allow running e2e unit tests with this API.

References:

• https://github.com/punchy98/obsidian-remote
• https://github.com/linuxserver/docker-obsidian
• https://github.com/sytone/obsidian-remote
• https://forum.obsidian.md/t/obsidian-remote-running-obsidian-in-docker-with-browser-based-access/34312