[#409] Remove docker target

It would not work this way for non-root users. Let's postpone.

Signed-off-by: Stanislav Bogatyrev <stanislav@nspcc.ru>

Makefile

@@ -160,13 +160,5 @@ debpackage:
 			"Please see CHANGELOG.md for code changes for $(VERSION)"
 	dpkg-buildpackage --no-sign -b
 
-docker/debpackage:
-	docker run --rm -t \
-	-v `pwd`:/src \
-	-w /src \
-	-u "$$(id -u):$$(id -g)" \
-	--env HOME=/src \
-	golang:$(GO_VERSION) apt update && apt install debhelper-compat dh-sequence-bash-completion devscripts && make debpackage
-
 debclean:
 	dh clean

docs/building-deb-package.md

@@ -32,14 +32,6 @@ or
 $ dh clean
 ```
 
-# Building in container
-
-Build dependencies will be added to Go container and package will be built.
-
-```shell
-$ sudo make docker/debpackage
-```
-
 # Package versioning
 
 By default, package version is based on product version and may also contain