Cannot stage packages with charmcraft
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Issue body
### Bug Description
A simple charmcraft yaml w/ stage packages breaks with error: `Unknown error: E:The method driver /snap/charmcraft/4914/usr/lib/apt/methods/http could not be found.`.
```
name: test
type: charm
title: test charm
summary: test summary
description: test description
base: ubuntu@24.04
parts:
charm:
plugin: nil
stage-packages:
- wget
platforms:
amd64:
```
### To Reproduce
use the charmcraft.yaml above and run `charmcraft pack`
### Environment
$ charmcraft --version
charmcraft 3.2.1
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.5 LTS
Release: 22.04
Codename: jammy
### charmcraft.yaml
```yaml
name: test
type: charm
title: test charm
summary: test summary
description: test description
base: ubuntu@24.04
parts:
charm:
plugin: nil
stage-packages:
- wget
platforms:
amd64:
```
### Relevant log output
```shell
Unknown error: E:The method driver /snap/charmcraft/4914/usr/lib/apt/methods/http could not be found.
Failed to execute charmcraft in instance.
```
```
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