ci(deb): include codename in version to avoid reprepro shared-pool conflicts

trixie and noble packages contain different compiled venv binaries (rencode
C extension differs between distros). Reprepro's pool is shared across all
codenames, so same-named files with different checksums are rejected.

Fix: inject distro codename into the version (e.g. 2.2.1~dev0+trixie.EPOCH-1)
so each distro's packages land in a distinct pool path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: flound1129

.github/workflows/deb.yml

@@ -64,10 +64,11 @@ jobs:
       - name: Inject build version
         env:
           EPOCH: ${{ needs.setup.outputs.epoch }}
+          CODENAME: ${{ matrix.version }}
         run: |
           PKG_VER=$(dpkg-parsechangelog -S Version)
           BASE_VER="${PKG_VER%-*}"
-          NEW_VER="${BASE_VER}+${EPOCH}-1"
+          NEW_VER="${BASE_VER}+${CODENAME}.${EPOCH}-1"
           sed -i "1s/${PKG_VER}/${NEW_VER}/" debian/changelog
 
       - name: Build packages