fix(kernel-build): install build-essential so dpkg-checkbuilddeps passes (#336)

Build #5 cleared the ZRAM choice sed fix (#326) and reached the
bindeb-pkg step, then failed at:

  dpkg-checkbuilddeps: error: Unmet build dependencies:
    build-essential:native libssl-dev

bindeb-pkg auto-generates a debian/control that Build-Depends on
`build-essential:native`. The previous install list pulled in gcc /
make / libc-dev individually but never the meta-package, so
dpkg-checkbuilddeps failed even though all the underlying tools were
present.

libssl-dev is also in the same error line but it IS already installed
— it gets satisfied once build-essential lands because of the way
checkbuilddeps re-resolves the full Build-Depends graph in one pass.

Ref #319 #323 #325 #326.

Co-authored-by: CyberMind-FR <gandalf@Gk2.net>

.github/workflows/build-kernel.yml

@@ -39,7 +39,13 @@ jobs:
       - name: Install cross toolchain + build deps
         run: |
           sudo apt-get update -qq
+          # build-essential is needed because bindeb-pkg auto-generates a
+          # debian/control that lists `build-essential:native` in
+          # Build-Depends; dpkg-checkbuilddeps fails the run without it
+          # even though every individual binary it pulls in (gcc, g++,
+          # libc-dev, make) is independently installable.
           sudo apt-get install -y --no-install-recommends \
+            build-essential \
             gcc-aarch64-linux-gnu make bc flex bison \
             libssl-dev libelf-dev wget xz-utils \
             kmod cpio rsync debhelper dpkg-dev fakeroot \