feat: add creation of sha256 checksum

[noelmiller]

Purpose

There is a desire by the team to include a sha256 checksum with every creation of an ISO.

Closes #29

What I did

Added bash command to create sha256 checksum after ISO creation is completed

Tests

Feel free to review build artifacts of recently completed Build ISO tests to validate function.

[bsherman]

Am I missing something? I don't see the sha256 checksum files in artifacts on test ISO workflow.

[noelmiller]

Am I missing something? I don't see the sha256 checksum files in artifacts on test ISO workflow.

The artifact is downloaded as a zip file. I should probably rename that to .zip at this point.

[bsherman]

Am I missing something? I don't see the sha256 checksum files in artifacts on test ISO workflow.

The artifact is downloaded as a zip file. I should probably rename that to .zip at this point.

I don't see a zip file either. just ISO files

[noelmiller]

Am I missing something? I don't see the sha256 checksum files in artifacts on test ISO workflow.

The artifact is downloaded as a zip file. I should probably rename that to .zip at this point.

I don't see a zip file either. just ISO files

Click on one of the artifacts in this page and download it. it will download it as a .zip file: https://github.com/ublue-os/isogenerator/actions/runs/8026385034?pr=30

I'll fix the name of the file in a different PR to avoid confusion.

[bsherman]

Ok, downloaded the *.iso artifact which is actually a ZIP :-) and within i found both the iso and the checksum file.

and...

$ sha256sum -c base-main-38-CHECKSUM
base-main-38.iso: OK