container: Add secretsocket, chase2fa scripts

While the original intent of the `secretsocket` script was to have `rbw`
run outside the `xactfetch` container, that is only useful during
development; both processes need to run in the container in Kubernetes.

.containerignore

@@ -1,6 +1,8 @@
 *
 !.git
+!chase2fa.py
 !entrypoint.sh
 !pinentry-stub.sh
 !pyproject.toml
+!secretsocket.py
 !xactfetch.py