feat: configurable event filter

[buchdag]

This PR make use of the new Docker API event format available on Docker API v1.22+ (the old event format is automatically translated to the new one by fsouza/go-dockerclient) and make docker-gen watch for network connect and disconnect events.

Close #190

Ping @outdooracorn

[outdooracorn]

Thanks for creating this PR 🙌
I use docker-gen as part of the nginx-proxy container. What would be the best way to test this PR? Build the binary locally and then docker cp it into the container?

[buchdag]

I've pushed a custom built nginx-proxy image for you to test: docker pull nginxproxy/nginx-proxy:network-event

[buchdag]

@outdooracorn any luck trying nginxproxy/nginx-proxy:network-event ? Let me know if you need any help.

[buchdag]

Ping @outdooracorn 👋

[Copilot]

Pull Request Overview

This PR enhances docker-gen by updating the Docker event handling to support network connect and disconnect events using the new Docker API event format. Key changes include:

• Updating test fixtures in generator_test.go to reflect the new event format.
• Refactoring the event filtering logic in generator.go to handle both container and network events.
• Updating the Docker API version information in the test fixture.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
internal/generator/generator_test.go	Updated test events and Docker version to match the new event format.
internal/generator/generator.go	Refactored event handling to include network events using slices.Contains.

Comments suppressed due to low confidence (1)

internal/generator/generator_test.go:29

• The test cases currently validate container event handling; consider adding separate tests to validate network connect and disconnect events to ensure full coverage of the new functionality.

{"Type":"container","Action":"start","Actor": {"ID":"8dfafdbc3a40"},"Time":1374067924}

[buchdag]

I decided to make this configurable via a new -event-filter flag rather than changing the default.