Add file existence checks to talos asset targets to prevent
rebuilding kernel, initramfs, installer, iso, nocloud, and metal
assets when they already exist from a previous build step.
This fixes duplicate talos builds in the release pipeline where
`make build` and `make assets` both triggered talos image generation.
Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Andrei Kvapil <kvapss@gmail.com>
Move common-envs.mk and package.mk from scripts/ to hack/ directory.
Update all Makefile includes to use new paths. Remove unused
issue-flux-certificates.sh script.
Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Andrei Kvapil <kvapss@gmail.com>