gha: add linux/arm/v5 to list of platforms

[thaJeztah]

• relates to https://github.com/moby/moby/pull/46982

We include this in the moby/moby repo, but it looks like we didn't for the CLI.

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

Heh. Looks like alpine doesn't support v5 anymore?

 > [build-alpine 1/1] RUN xx-apk add --no-cache musl-dev gcc:
0.064 fetch https://dl-cdn.alpinelinux.org/alpine/v3.20/main/armel/APKINDEX.tar.gz
0.237 fetch https://dl-cdn.alpinelinux.org/alpine/v3.20/community/armel/APKINDEX.tar.gz
0.237 WARNING: fetching https://dl-cdn.alpinelinux.org/alpine/v3.20/main: No such file or directory
0.264 WARNING: fetching https://dl-cdn.alpinelinux.org/alpine/v3.20/community: No such file or directory
0.265 ERROR: unable to select packages:
0.265   alpine-keys (no such package):
0.265     required by: world[alpine-keys]
------
Dockerfile:25
--------------------
  23 |     ARG TARGETPLATFORM
  24 |     # gcc is installed for libgcc only
  25 | >>> RUN xx-apk add --no-cache musl-dev gcc

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