package: ensure all deb requires are present

[dumbmoron]

No description provided.

[greptile-apps]

Important Files Changed

Filename	Overview
docker/package.Dockerfile	Adds a RUN apt install step for Chromium runtime libraries needed by the ldd sanity check in mkdeb.sh. Uses --no-install-recommends to keep the image lean.
package/mkdeb.sh	Adds a pre-build sanity check that extracts the helium binary from the tarball, runs ldd against it, and fails if any shared libraries are reported as not found. The EXIT trap is correctly updated to cover the new temp file, but ldd failures themselves are not explicitly caught.

_{Reviews (2): Last reviewed commit: "package: ensure all deb requires are pre..." | Re-trigger Greptile}

[dumbmoron]

@greptileai