ci: Log the output of uname -a

Indicate which kernel version we are working with.

(backport <#4760>)
(cherry picked from commit cc3cee4)

Author: tgross35

ci/run.sh

@@ -9,6 +9,9 @@ target="$1"
 
 export RUST_BACKTRACE="${RUST_BACKTRACE:-1}"
 
+# For logging
+uname -a
+
 cmd="cargo test --target $target ${LIBC_CI_ZBUILD_STD+"-Zbuild-std"}"
 test_flags="--skip check_style"