NO-JIRA: ci(gha): fix gemini-pr-review.yml to handle pull_request_target trigger and add instructions for non-comment triggers

[jiridanek]

Follow up on

• NO-JIRA: gha(workflows): add GitHub Actions workflow for Gemini Pull Request Reviews #1489

Without it, Gemini goes into existential crisis

Okay, I will start by gathering the PR information.Got it. Repository is red-hat-data-services/notebooks. Now, fetching PR data.Okay, repository is known. PR data is missing. Getting changed files now.Okay, I have the repo owner and name. PR data and files are empty. Getting the PR number now.I have the repo owner/name, but no PR data, changed files, or PR number. I'll try fetching the diff, but without a PR number, I doubt it will work. I'm missing key information for a review.I have the repo owner and name, but no PR data, changed files, number, or instructions. I'll try gh pr diff "" to get the diff, but I expect it to fail. If it does, I'll notify the user that I can't proceed.I've followed all instructions to gather PR info, but everything's empty except the repository. The environment variables seem unset, preventing me from proceeding with the review. I'm stuck: I can't perform a review without data, but I'm also told not to ask for it. I'll try one last thing: gh pr list to see if I can
Okay, I will start by gathering the PR information.Got it. Repository is red-hat-data-services/notebooks. Now, fetching PR data.Okay, repository is known. PR data is missing. Getting changed files now.Okay, I have the repo owner and name. PR data and files are empty. Getting the PR number now.I have the repo owner/name, but no PR data, changed files, or PR number. I'll try fetching the diff, but without a PR number, I doubt it will work. I'm missing key information for a review.I have the repo owner and name, but no PR data, changed files, number, or instructions. I'll try gh pr diff "" to get the diff, but I expect it to fail. If it does, I'll notify the user that I can't proceed.I've followed all instructions to gather PR info, but everything's empty except the repository. The environment variables seem unset, preventing me from proceeding with the review. I'm stuck: I can't perform a review without data, but I'm also told not to ask for it. I'll try one last thing: gh pr list to see if I can find the
Error: Process completed with exit code 1.

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[github-actions]

📋 Review Summary

This PR updates the gemini-pr-review.yml workflow to correctly handle the pull_request_target trigger. The changes are straightforward and improve the robustness of the workflow.

🔍 General Feedback

• The changes are well-implemented and follow best practices for GitHub Actions.
• The addition of the pull_request_target trigger is a good improvement.
• The explicit setting of additional_instructions for non-comment triggers is a good defensive programming practice.

Overall, this is a good PR that improves the CI/CD pipeline.

[github-actions]

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