fix: switch to build-package.sh for .deb builds

* fix: switch to build-package.sh for .deb builds

Replace dpkg-buildpackage with scripts/build-package.sh using
dpkg-deb --build approach. This bypasses the dpkg-buildpackage
subprocess chain (dh → make → debian/rules → cargo) which
does not inherit the rustup environment (RUSTUP_HOME, CARGO_HOME,
default toolchain) from GitHub Actions.

Same approach as Linux-Patch-Manager which passes CI.

- Add scripts/build-package.sh (modeled after Manager)
- Add Version and Installed-Size to debian/control
- Update CI workflow to use build-package.sh
- Fix release files path (project root, not ../)

* fix: extract only binary package paragraph from debian/control

dpkg-deb --build expects a single control paragraph starting
with Package: field. The debian/control file has two paragraphs
(source + binary). The awk command extracts only the binary
package paragraph to avoid dpkg-deb parse errors.

* fix: generate DEBIAN/control from scratch in build-package.sh

dpkg-deb --build is fundamentally incompatible with debian/control
which uses dpkg-buildpackage substitution variables like
${shlibs:Depends} and ${misc:Depends}. Generate a clean control
file from scratch in the script to eliminate all incompatibilities.

- No substitution variables
- No source paragraph
- No Build-Depends
- Homepage points to GitHub
- Installed-Size calculated before control file generation

---------

Co-authored-by: git-echo <git-echo@moon-dragon.us>

.github/workflows/ci.yml

@@ -82,11 +82,9 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - name: Install system dependencies
-        run: sudo apt-get update && sudo apt-get install -y build-essential libsystemd-dev pkg-config libssl-dev dpkg-dev debhelper
+        run: sudo apt-get update && sudo apt-get install -y libsystemd-dev pkg-config libssl-dev
       - name: Build .deb package
-        run: |
-          . "$HOME/.cargo/env"
-          sudo env "PATH=$PATH" dpkg-buildpackage -us -uc -b -d
+        run: chmod +x scripts/build-package.sh && scripts/build-package.sh
       - name: Generate release notes
         if: startsWith(github.ref, 'refs/tags/v')
         id: release_notes
@@ -105,4 +103,4 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           body: ${{ steps.release_notes.outputs.notes }}
-          files: ../linux-patch-api_*.deb
+          files: linux-patch-api_*.deb