Fix workflows failing because releases weren't being found

[crschardt]

GitHub rate limits API requests. The install.sh script uses the API through curl to determine the download URL for the correct PhotonVision jar file for each image. Building the images resulted in enough closely spaced calls to trigger the rate limit for some runners with the resulting response from the server:

{"message":"API rate limit exceeded for XXX.XXX.XXX.XXX. (But here'\''s the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)","documentation_url":"https://docs.github.com/rest/overview/resources-in-the-rest-api#rate-limiting"}

The rate limit is fairly low for anonymous requests and much higher for authenticated ones. This PR fixes the problem by updating the install.sh script to use the GITHUB_TOKEN to authenticate the request when running as a workflow.