Declaring ca-certificates in stage-packages doesn't populate the /etc/ssl/certs directory
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### Bug Description
When declaring `ca-certificates` in the part's `stage-packages`, the `/etc/ssl/certs` directory is not populated as expected. The `/etc/ssl/certs` should contain symbolic links pointing to the certificates found in `/usr/share/ca-certificates/mozilla/`. It's worth noting that certificates are present in `/usr/share/ca-certificates/mozilla/` within the Rock image.
### To Reproduce
Build the rock image based on the `rockcraft.yaml` file below, and then inspect the content of `/etc/ssl/certs` directory in the image. The directory is empty.
```bash
rockcraft pack
sudo /snap/rockcraft/current/bin/skopeo --insecure-policy copy oci-archive:ca-certs_0.1_amd64.rock docker-daemon:ca-certs:latest
docker run -it --rm --entrypoint /bin/ls ca-certs:latest -lah /etc/ssl/certs
```
### Environment
ubuntu 22.04 LTS, LXD
### rockcraft.yaml
```shell
# Copyright 2023 Canonical Ltd.
# See LICENSE file for licensing details.
name: ca-certs
summary: ca-certs issue.
description: ca-certs issue.
version: "0.1"
base: ubuntu:20.04
license: Apache-2.0
platforms:
amd64:
parts:
apt-dependencies:
plugin: nil
source: .
stage-packages:
- ca-certificates
```
### Relevant log output
```shell
N/A
```
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