doc: introduce CODEOWNERS

Using this file, we can automatically assign people to review certain parts of our code.

For now, we'll add the container related things.

This will also be used to let Renovate know who should be assigned to PRs regarding containers.

Author: poikilotherm

.github/CODEOWNERS

@@ -0,0 +1,8 @@
+
+# Any container related stuff should be assigned to / reviewed by Oliver and/or Phil
+modules/container-configbaker/** @poikilotherm @pdurbin
+modules/container-base/** @poikilotherm @pdurbin
+src/main/docker/** @poikilotherm @pdurbin
+docker-compose-dev.yml @poikilotherm @pdurbin
+.github/workflows/scripts/containers** @poikilotherm @pdurbin
+.github/workflows/container_* @poikilotherm @pdurbin