Update Release action with Linux

[marnovandermaas]

We need to update the release action: https://github.com/lowRISC/mocha/blob/main/.github/workflows/release.yml
With all the artefacts necessary to run:

util/fpga_runner.py run -e fw_payload.elf -f Image 0x90000000 -f rootfs_uboot_image 0xa0000000