ci: Allow retrying Rust tests, when also running visual tests, temporarily

Because of a crash in the Ubuntu 22.04 graphics drivers.

Author: torokati44

.github/workflows/test_rust.yml

@@ -94,7 +94,9 @@ jobs:
 
       - name: Run tests with image tests
         if: runner.os != 'macOS'
-        run: cargo nextest run --workspace --locked --no-fail-fast -j 4 --features imgtests,lzma,jpegxr
+        # TODO: Disallow retries in general once we can allow only after SIGABRT.
+        # See: https://github.com/nextest-rs/nextest/issues/1172
+        run: cargo nextest run --workspace --locked --no-fail-fast --retries 2 -j 4 --features imgtests,lzma,jpegxr
         env:
           XDG_RUNTIME_DIR: '' # dummy value, just to silence warnings about it missing