Fix Digest Mismatch error on Enterprise Linux installations when FIPS mode enabled

[jonathan-dove]

Summary

Added fpm argument to the package.json file to change the hashing algorithm from md5 to sha256. This fixes an issue introduced in RHEL8+ and/or clones where if FIPS mode is enabled rpm digests must be hashed with at minimum sha256 to be allowed to be installed without bypassing security measures put in place by the FIPS standards.

Ticket Link

https://github.com/mattermost/desktop/issues/3190

Checklist

• [x] read and understood our Contributing Guidelines
• [x] completed Mattermost Contributor Agreement
• [x] executed npm run lint:js for proper code formatting

Device Information

This PR was tested on: RHEL 8, RHEL 9, Rocky9, Rocky8

Release Note

Modified rpm-digest to utilize sha256 instead of md5 to all for rpm installation on FIPS mode enabled Enterprise Linux systems.

[mattermost-build]

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[devinbinnie]

@jonathan-dove Thanks for the PR! So those changes actually need to go into electron-builder.json. There's already an fpm section there, so you can add the command line option there.

[jonathan-dove]

@jonathan-dove Thanks for the PR! So those changes actually need to go into electron-builder.json. There's already an fpm section there, so you can add the command line option there.

Fantastic. I will move this there. Thanks! @devinbinnie Should this be a seperate pull request or should I just add a commit to this PR?