### Bug description

I think when linking to the source file, it would be nice if the `code-tools: source: repo` linked to exact commit for that file on GitHub. 

For my personal blog, I used to do something like this:

```typescript
const commit = child_process
  .spawnSync("git", ["log", "-n", "1", "--pretty=format:%H", "--", `${filename}`])
  .stdout.toString();
metadata.source = `https://github.com/kdheepak/blog/blob/${commit}/${filename}`;
```



### Checklist

- [ ] Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [ ] Please [format your issue](https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us) so it is easier for us to read the bug report.
- [ ] Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [ ] Please document the operating system you're running. If on Linux, please provide the specific distribution.
- [ ] Please provide the output of `quarto check` so we know which version of quarto and its dependencies you're running.
dragonstyle
2023-03-14T03:57:40Z
kdheepak
enhancement
v1.4
open
When using `code-tools: source: repo` link to exact commit
https://github.com/quarto-dev/quarto-cli/issues/4819