Linux Crashpad fix (#890)

- **Replace crashpad static-libc++ patch file with `io.replace()` in `on_install`** — The old `.patch` file was fragile (trailing-whitespace stripping on Windows would silently break it). Using `io.replace()` in the xmake build script is more robust and easier to maintain.
- **Skip sentry-native `on_test` link check on Linux** — The link test requires `-lc++abi` when building with the UE clang toolchain but adding it unconditionally breaks GCC/libstdc++ builds. The zenserver build itself validates that the library is usable.
- **Add `crashpad-test.sh`** — A test script that launches a release zenserver, waits for the health endpoint, then verifies that `crashpad_handler` is running, no `sentry_init` failure was logged, and the handler has no dynamic `libc++.so.1` dependency.
- **Add Crashpad Check step to Linux release CI** — Runs `crashpad-test.sh` in the `validate` workflow for release builds to catch crashpad regressions before merge.

1 files changed, 6 insertions, 0 deletions

diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 932020337..601f000fe 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -178,6 +178,12 @@ jobs:
       run: |
         xmake bundle -v -y
 
+    - name: Crashpad Check
+      if: ${{ matrix.config == 'release' }}
+      shell: bash
+      run: |
+        ./scripts/test_linux/crashpad-test.sh build/linux/${{ matrix.arch }}/release/zenserver
+
     - name: Upload zenserver-linux
       if: ${{ github.ref_name == 'main' && matrix.config == 'release' }}
       uses: actions/upload-artifact@v3-node20