use --exact on --skip to avoid unintended substring matches

Without the `--exact` flag, using `--skip tests/rustdoc` can unintentionally skip other
tests that match as substrings such as `rustdoc-gui`, `rustdoc-js`, etc.

For debugging, run: `./x.py --stage 2 test rustdoc-ui --skip tests/rustdoc` and
`./x.py --stage 2 test rustdoc-ui --skip tests/rustdoc -- --exact`

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/ci/github-actions/jobs.yml

@@ -48,7 +48,7 @@ runners:
 
 envs:
   env-x86_64-apple-tests: &env-x86_64-apple-tests
-    SCRIPT: ./x.py --stage 2 test --skip tests/ui --skip tests/rustdoc
+    SCRIPT: ./x.py --stage 2 test --skip tests/ui --skip tests/rustdoc -- --exact
     RUST_CONFIGURE_ARGS: --build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc
     RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
     MACOSX_DEPLOYMENT_TARGET: 10.12