Auto build ISO

[kurowski]

See https://blue-build.org/how-to/generate-iso/

• add github action
• configure azure secrets
• upload to azure blob storage

[kurowski]

sudo bluebuild generate-iso --iso-name eapnix-dx.iso image ghcr.io/uceap/eapnix-dx
az storage blob upload --account-name bkurowskitest --container-name linux --overwrite --file eapnix-dx.iso
az storage blob upload --account-name bkurowskitest --container-name linux --overwrite --file eapnix-dx.iso-CHECKSUM