armbian-next: firmware: don't build -full firmware if not on CI/noninteractive and board's not going to use it

- move `fakeroot_dpkg_deb_build()` from runners.sh to new utils-dpkgdeb.sh
  - and make it debug show the size of the source
- clean off `.git` directory earlier for full build
- @TODO: get rid of the "hardlinks" funky biz in there and not-copy `.git` to begin with

lib/functions/logging/runners.sh

@@ -122,12 +122,6 @@ function chroot_custom() {
 	raw_command="$*" raw_extra="chroot_custom" TMPDIR="" run_host_command_logged_raw chroot "${target}" /bin/bash -e -o pipefail -c "$*"
 }
 
-# for deb building.
-function fakeroot_dpkg_deb_build() {
-	display_alert "Building .deb package" "$(basename "${3:-${2:-${1}}}" || true)" "debug"
-	run_host_command_logged_raw fakeroot dpkg-deb -b "-Z${DEB_COMPRESS}" "$@"
-}
-
 # for long-running, host-side expanded bash invocations.
 # the user gets a pv-based spinner based on the number of lines that flows to stdout (log messages).
 # the raw version is already redirect stderr to stdout, and we'll be running under do_with_logging,