Demonstrate how to troubleshoot Docker container actions

[lfarci]

Troubleshooting Docker container actions involves several steps. Here's a step-by-step guide:

1. Check the Workflow Log: The first step in troubleshooting is to check the workflow log in GitHub. This will show you the output of your action and any error messages.

2. Check the Dockerfile: Make sure your Dockerfile is correct. This includes checking that the base image is correct, all necessary dependencies are installed, and the ENTRYPOINT is correct.

3. Build and Run the Docker Image Locally: If the error message isn't clear, you can build and run the Docker image locally to see if the problem occurs there as well.

4. Add Debug Messages: If you're still having trouble, you can add debug messages to your action. In Docker container actions, you can use echo "Your debug message" to add a debug message.

Here's an example of how you might build and run your Docker image locally and add a debug message:

# Your Dockerfile
FROM debian:9.5-slim

ADD entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]

# Your entrypoint.sh
#!/bin/sh -l

# Add a debug message
echo "Starting action"

# Your action's code here

echo "Finished action"

To build and run this Docker image locally, you would do something like this:

# Build the Docker image
docker build -t my-action .

# Run the Docker image
docker run my-action

Remember to replace 'Starting action', 'Finished action', and 'my-action' with the debug messages and Docker image name that are appropriate for your action.