docs: do not hardcode version

use the debian package ones, if not defined we're doing a dev build

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

Makefile

@@ -37,6 +37,8 @@ CARGO ?= cargo
 COMPILED_BINS := \
 	$(addprefix $(COMPILEDIR)/,$(USR_BIN) $(USR_SBIN) $(SERVICE_BIN))
 
+export DEB_VERSION DEB_VERSION_UPSTREAM
+
 SERVER_DEB=${PACKAGE}-server_${DEB_VERSION}_${ARCH}.deb
 CLIENT_DEB=${PACKAGE}-client_${DEB_VERSION}_${ARCH}.deb
 DOC_DEB=${PACKAGE}-docs_${DEB_VERSION}_all.deb