Add debian packaging files

This doesn't quite work, since the debuild stuff refuses to see the
rustup-installed cargo/rustc, which is required for our build.

debian/rules

@@ -0,0 +1,26 @@
+#!/usr/bin/make -f
+
+
+RUST_RELEASE_CHANNEL = nightly
+
+MAKE_ARGS = \
+	RUST_RELEASE_CHANNEL=$(RUST_RELEASE_CHANNEL) \
+	PREFIX=/usr \
+	SYSCONFDIR=/etc \
+	DESTDIR=debian/bscreensaver
+
+%:
+	dh $@
+
+override_dh_auto_clean:
+	@echo "HOME=$$HOME"
+	@echo "PATH=$$PATH"
+	ls $$HOME/.rustup
+	ls $$HOME/.cargo
+	dh_auto_clean -- $(MAKE_ARGS)
+
+override_dh_auto_build:
+	dh_auto_build -- $(MAKE_ARGS)
+
+override_dh_auto_install:
+	dh_auto_install -- $(MAKE_ARGS)