ci: force reinstall of kernel headers in asan

When using hosted runners in combination with cached docker images,
there is the possibility that the host runner image is updated,
rendering the linux-headers package (stored in the cached docker image)
incompatible.

Fix this by doing a re-install of the headers package in
03_test_script.sh.

If the underlying runner kernel has not changed thie has no effect, but
prevents the job from failing if it has.

Author: willcl-ark

ci/test/03_test_script.sh

@@ -24,6 +24,14 @@ fi
 echo "Free disk space:"
 df -h
 
+# We force an install of linux-headers again here via $PACKAGES to fix any
+# kernel mismatch between a cached docker image and the underlying host.
+# This can happen occasionally on hosted runners if the runner image is updated.
+if [[ "$CONTAINER_NAME" == "ci_native_asan" ]]; then
+  $CI_RETRY_EXE apt-get update
+  ${CI_RETRY_EXE} bash -c "apt-get install --no-install-recommends --no-upgrade -y $PACKAGES"
+fi
+
 # What host to compile for. See also ./depends/README.md
 # Tests that need cross-compilation export the appropriate HOST.
 # Tests that run natively guess the host