[gdb/testsuite] Add gdb.src/pre-commit.exp

Add a test-case running the pre-commit hooks, as suggested here [1].

[1] https://sourceware.org/pipermail/gdb-patches/2025-October/221441.html

gdb/testsuite/gdb.src/pre-commit.exp

@@ -0,0 +1,36 @@
+# Copyright 2025 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Run the pre-commit hooks.
+
+set repodir $srcdir/../..
+
+if {![file isdirectory $repodir/.git]} {
+    unsupported "Not in a git repository"
+    return
+}
+
+cd $repodir
+
+set result [remote_exec build "pre-commit --version"]
+set status [lindex $result 0]
+if {$status != 0} {
+    unsupported "pre-commit missing or broken"
+    return
+}
+
+set result [remote_exec build "pre-commit run --all-files -v"]
+set status [lindex $result 0]
+gdb_assert {$status == 0} "pre-commit checks"