make: use GO_VERSION=1 for release builds

We have forgotten to bump GO_VERSION in our Dockerfile several times
when doing releases from old release branches, leading to use using
EOL'd Go versions for releases. We should just always use the latest
version when building our release artefacts.

Signed-off-by: Aleksa Sarai <[email protected]>
(cherry picked from commit 174ccef)
Signed-off-by: Aleksa Sarai <[email protected]>

Author: cyphar

Makefile

@@ -1,6 +1,9 @@
 SHELL = /bin/bash
 
 CONTAINER_ENGINE := docker
+CONTAINER_ENGINE_BUILD_FLAGS ?=
+CONTAINER_ENGINE_RUN_FLAGS ?=
+
 GO ?= go
 
 PREFIX ?= /usr/local
@@ -112,6 +115,7 @@ releaseall: RELEASE_ARGS := "-a 386 -a amd64 -a arm64 -a armel -a armhf -a ppc64
 releaseall: release
 
 .PHONY: release
+release: CONTAINER_ENGINE_BUILD_FLAGS := --build-arg GO_VERSION=1
 release: runcimage
 	$(CONTAINER_ENGINE) run $(CONTAINER_ENGINE_RUN_FLAGS) \
 		--rm -v $(CURDIR):/go/src/$(PROJECT) \