Feature/use docker proxy

[dyay108]

• Use DOCKER_PROXY_URL (fall back to DOCKER_HOST, then unix socket) for Docker client connection.
• Document DOCKER_PROXY_URL in the README.

Summary by CodeRabbit

• New Features

  • Support for configuring a Docker API proxy via the DOCKER_PROXY_URL environment variable, with automatic fallback to existing Docker connection settings.

• Documentation

  • README updated to document the new DOCKER_PROXY_URL environment variable and its behavior.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a new DOCKER_PROXY_URL environment variable to README and updates the Python agent to resolve the Docker client base URL from DOCKER_PROXY_URL, then DOCKER_HOST, then a default unix:///var/run/docker.sock.

Changes

Cohort / File(s)	Summary
Documentation README.md	Adds DOCKER_PROXY_URL environment variable to environment variables table (descriptive only).
Docker Client Configuration caddy-agent-watch.py	Replaces hardcoded Docker socket with dynamic base URL resolution: use trimmed DOCKER_PROXY_URL if set, else DOCKER_HOST, else default unix:///var/run/docker.sock.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 I nibble on code and sniff the air,
A proxy hop brings Docker near or far,
Env vars guide where connections pair,
Fallbacks snug like carrots in a jar —
Hooray for flexible endpoints, hip-hip-hurrah!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main feature being added - support for using a Docker proxy URL to configure Docker client connections.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@caddy-agent-watch.py`:
- Around line 44-45: The default Docker socket URL uses the old double-slash
form; update the fallback in the _docker_base_url assignment to use the modern
triple-slash form "unix:///var/run/docker.sock" so that _docker_base_url =
DOCKER_PROXY_URL.strip() or os.getenv("DOCKER_HOST",
"unix:///var/run/docker.sock"); leave the DockerClient creation (client =
docker.DockerClient(base_url=_docker_base_url)) unchanged so it picks up the
corrected URL.

🧹 Nitpick comments (1)

caddy-agent-watch.py (1)

44-45: Consider logging the Docker base URL at startup for debugging.

When troubleshooting Docker connectivity issues, it would be helpful to see which Docker endpoint is being used. The startup logging section (around line 1590) could include this information.

💡 Suggested addition to startup logging

Add after line 1590:

    logger.info(f"   Docker URL: {_docker_base_url}")