feat: add docker service availability monitoring

[SheepReaper]

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Description

Introduces Docker service availability to monitor uptime and status of Docker services alongside existing types. Updates the database schema to support "docker_service". Enhances the user interface to allow configuration of Docker service parameters within the monitor setup.

This change allows for more granular monitoring capabilities by checking the running state of services in a Docker environment.

Relates to implementing extended Docker monitoring functionalities.

implements #5214

Type of change

• User interface (UI)
• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas (including JSDoc for methods)
• My changes generates no new warnings
• My code needed automated testing. I have added them (this is optional task)

Screenshots (if any)

@louislam

[CommanderStorm]

Lets go back one step to the conceptual level how this should be done:

We are currently in the migration towards a few things that are relevant for this PR:

• we are migrating from the ginormous monior.js to more maintainable monitoring types. See reddis for a similar PR.
  => This PR needs to use the newer variant.
• having two really close monitors is not ideal for users. Please merge this with the docker monitor unless there is a reason this should not happen
• For monitors, we need testcases (f.ex. via testcontainers) to prevent stupid regressions in the future. If this is not possible, that is another story, but I think it likely is => we should try to do so.
  See feat: add RabbitMQ monitor #5199 for a PR on how to use testcontainers
• Please have a look at this file and check if the newer conditional approach can work for this monitor

I have changed this to a draft to communicate the early stage of the PR to others better. Feel free to change once this fits better. ^^
If you have any trouble with one of the comments above, feel free to comment.

[SheepReaper]

• I looked for a docker monitor type, there does not appear to be one in the master branch. Is there another branch where this refactor exists?
• Am I being asked to perform said refactor?
• The existing method of checking container status, and the new one I've introduced here are extremely similar code-wise, but they are checking different things. Namely, the existing checks via the container API, which is fine for a single-node docker deployment, whereas mine checks the service, via the services API. It's fundamentally a different concept. A service is UP if at least 1 container that supports it is running.
• I also wanted to eventually implement a 3rd monitor type to check the "health" of a service since kuma has an intermediate status. In this implementation we care about the exact number of running containers supporting a service. But it's more complex since I need to make use of multiple docker API's in order to get all of the information needed to make that determination.
• I've never used the @testcontainers package, but a quick glance here: https://testcontainers.com/modules/ doesn't seem to indicate that a "docker" container exists, nor is that really what I want. Since this series of monitors checks the system running the containers.
• I can instead achieve the tests you're asking for by just mocking the axios responses, no need for @testcontainers.

Please clarify what you're asking of me. I only wanted to contribute a simple addition to the platform because I personally have need of it. But I'll consider contributing the refactor if the scope is clear.

[SheepReaper]

forgot tag: @CommanderStorm
for reference the existing docker monitor is embedded here: https://github.com/louislam/uptime-kuma/blob/master/server/model/monitor.js#L712

[CommanderStorm]

Am I being asked to perform said refactor?

Yes, please migrate to the newer monitoring type structure.
Adding new features to the unmaintainable pile is not workable.

It's fundamentally a different concept

For you it might, I don't think it is for other users (f.ex. me).
To name similarities, Oauth2 vs no auth are both inside of the http monitor.

If you look at this file, I think we can have a much nicer experience with a bit more effort ^^

doesn't seem to indicate that a "docker" container exists

For checking if the docker monitor can monitor docker containers (spawned via a testcontaier), there also does not need to be one.
Not sure if what I have in mind fully works => feel free to point out if it does not ^^

I can instead achieve the tests you're asking for by just mocking the axios responses

That is an alternative, but lets try to do it properly first