ci(profiler): install fixed parallel 1.2.14 in UBSAN job (temporary)

The php-8.5_bookworm-8 image ships parallel 1.2.13, which has a bug that
intermittently trips UBSAN in the profiler ASAN/UBSAN workflow's zts leg.
A fixed parallel 1.2.14 has been released, so install it over the image's
version before running the phpt tests on the zts build.

pecl refuses to reinstall while the extension is loaded, so its ini is
moved aside during the build and restored afterwards; the direct package
URL is used because the image's channel REST cache lags behind new
releases. nts is unaffected (parallel is ZTS-only).

TODO: remove this step once the CI images are rebuilt with
parallel >= 1.2.14.

Author: realFlowControl

.github/workflows/prof_asan.yml

@@ -127,6 +127,25 @@ jobs:
           cargo build --profile profiler-release
           cp -v "$CARGO_TARGET_DIR/profiler-release/libdatadog_php_profiling.so" "$(php-config --extension-dir)/datadog-profiling.so"
 
+      # TODO(parallel): the php-8.5_bookworm-8 image ships parallel 1.2.13, which
+      # has a bug that intermittently trips UBSAN. Install the fixed 1.2.14 over
+      # it (ZTS-only; parallel requires ZTS). Remove this step once the CI images
+      # are rebuilt with parallel >= 1.2.14.
+      - name: Install fixed parallel 1.2.14 (ZTS only, temporary until images rebuilt)
+        if: matrix.php-build == 'zts'
+        run: |
+          set -eux
+          switch-php zts
+          scan_dir="$(php -r 'echo PHP_CONFIG_FILE_SCAN_DIR;')"
+          # pecl refuses to reinstall while the extension is loaded, so move its
+          # ini aside during the build, then restore it so the test run loads the
+          # freshly installed parallel.so. Use the direct package URL because the
+          # channel REST cache in the image can lag behind new releases.
+          mv "$scan_dir/parallel.ini" /tmp/parallel.ini.disabled
+          yes '' | pecl install -f https://pecl.php.net/get/parallel-1.2.14.tgz
+          mv /tmp/parallel.ini.disabled "$scan_dir/parallel.ini"
+          php --ri parallel | grep -i version
+
       - name: Run phpt tests
         run: |
           set -eux