fix: compress signed msi for download by tauri updater

[ndom91]

☕️ Reasoning

• Compress the MSI after signing and replace the unsigned *.msi.zip in the S3 bucket dir for download by the Tauri updater.

🧢 Changes

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[ndom91]

@schacon unfortunately wasn't able to finish this before holidays. Running this in GHA produced all sorts of dumb issues like not finding zip, then not allowing sudo apt install zip, then not finding sudo, then running apt install zip couldn't resolve packages.ubuntu.org, etc etc 😂

So definitely needs some more debugging, but anyway here's the minisign-cli GHA you mentioned: https://github.com/marketplace/actions/minisign-cli. Feel free to add it here

[ndom91]

Is this syntax still supported? I thought it was:

- name: Set output
  run: echo "{name}={value}" >> $GITHUB_OUTPUT

[schacon]

Old school.

Technically they are still supported, but yes, I will change them to the new format.