[Feature]: Officially support startup script for fetching the latest release

[openhands-agent]

What problem or use case are you trying to solve?
Enhancing the startup script to fetch the latest release automatically. This functionality was proposed in Slack as a valuable feature to streamline the process of running the latest version efficiently.

Desired UX of the solution
The proposed script, once made official, should fetch the latest release from the GitHub API, use it to update and run the Docker container seamlessly, and integrate this process into the official repository or documentation.

Technical implementation
The script provided in Slack automates fetching the latest release tag using the GitHub API, handles Docker container management, and sets up the environment variables for runtime.

Alternatives considered

Enhancing current manual methods of fetching the latest version or not introducing the automation.

Additional context
N/A

Issue Created By: Graham Neubig on Slack
Link to Slack Thread: https://openhands-ai.slack.com/archives/C06P5NCGSFP/p1747933025595349?thread_ts=1747933025.595349&cid=C06P5NCGSFP