On GitHub PRs, the jcheck "binary" check doesn't detect a binary file that has been replaced.

For GitLab PRs, it also doesn't detect a new binary file (the check appears to do nothing on GitLab).

JDK-8334166 (jdk) and JDK-8334657 (jfx) enable Skara's binary check, which will show a warning when a PR has a binary file. This works for a newly added binary file, but does not work when an existing file is replaced with a different binary file.

Here are 3 Draft PRs that show the problem:

https://github.com/openjdk/jfx/pull/1478 : add binary file (OK)
https://github.com/openjdk/jfx/pull/1480 : replace existing binary file (FAIL)
https://github.com/openjdk/jfx/pull/1481 : both adds binary file (OK) and replaces existing binary file (FAIL)