Building for arm not possible on Raspberry Pi 3 (32 bit)
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Issue body
### Bug Description
Building a ROCK for arm does not work on a Raspberry Pi 3 running the 32 bit version of Ubuntu 22.04.
Rockcraft simply refuses to build with the following error message:
```
Error for platform entry 'arm': this machine's architecture (armv7l) is not compatible with the ROCK's target architecture. Can only build a ROCK for arm if the host is compatible with ['arm'].
```
### To Reproduce
```
rockcraft init
sed -i "s/amd64/arm/" rockcraft.yaml
rockcraft --verbose
```
### Environment
Raspberry Pi 3 Model B
Ubuntu Server 22.04.2 LTS
### rockcraft.yaml
```shell
name: my-rock-name # the name of your ROCK
base: ubuntu:22.04 # the base environment for this ROCK
version: '0.1' # just for humans. Semantic versioning is recommended
summary: Single-line elevator pitch for your amazing ROCK # 79 char long summary
description: |
This is my my-rock-name's description. You have a paragraph or two to tell the
most important story about it. Keep it under 100 words though,
we live in tweetspace and your description wants to look good in the
container registries out there.
license: GPL-3.0 # your application's SPDX license
platforms: # The platforms this ROCK should be built on and run on
arm:
parts:
my-part:
plugin: nil
```
### Relevant log output
```shell
Error for platform entry 'arm': this machine's architecture (armv7l) is not compatible with the ROCK's target architecture. Can only build a ROCK for arm if the host is compatible with ['arm'].
```
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