ci: add meson-test-debug pre-commit hook

Add the `meson-test-debug` hook to `.pre-commit-config.yaml` to run by
default on commits. It uses the default system compiler to compile the
project in Debug mode (`--buildtype=debug`) and executes the fast unit
and short integration test suites. Its build artifacts are isolated in
`.pre-commit-builds/default-debug`.

Author: fangfufu

.pre-commit-config.yaml

@@ -39,6 +39,15 @@ repos:
         language: system
         pass_filenames: false
         files: \.(c|h)$
+    -   id: meson-test-debug
+        name: Meson Test (Debug)
+        entry: >-
+          bash -c 'if [ ! -d .pre-commit-builds/default-debug ]; then
+          meson setup .pre-commit-builds/default-debug --buildtype=debug; fi &&
+          meson test -C .pre-commit-builds/default-debug'
+        language: system
+        pass_filenames: false
+        files: \.(c|h)$
     -   id: all-tests-gcc
         name: All Tests (GCC)
         entry: >-