Switch the snapcraft build from 'source: .' (which copies the full
20 GB repo including 18 GB of target/ and build artifacts into LXD)
to 'source: ./snap/prebuilt' (~130 MB of only the binaries and
metadata that snapcraft needs).
The snap-package workflow now downloads the same cli, gateway, and
supervisor binaries that other packaging jobs (deb, rpm, tarballs)
use. A new 'Prepare snap build directory' step assembles snap/prebuilt/
with the 3 binaries, gateway wrapper script, LICENSE, README.md, and
a precomputed version string — everything snapcraft needs without
any source tree access.
This addresses CI/CD Improvements (issue #1361) by reducing data
transferred into the LXD sandbox by ~150x and eliminating the need
for snapcraft to traverse the entire repository tree.
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
dependabot[bot]