[CI] don't ignore missing artifact files

Build

Success

Set up job26s
Install Dependencies29s
Checkout2s
Hash west module3s
Cache west modules2m0s
West Init0s
West Update4m19s
West Zephyr export1s
West Build (Corne Left)1m9s
Corne Left Kconfig file1s
Rename zmk.uf20s
West Build (Corne Right)39s
Corne Right Kconfig file0s
Rename zmk.uf20s
Zip Artifacts0s
Upload Artifact2s
Complete job2m5s