Makefile: enable GOPROXY to work around vanity URL being offline

The https://honnef.co/go/tools domain looks to be offline, causing projects that
do not use vendoring to fail:

    go: downloading google.golang.org/protobuf v1.27.1
    go: downloading github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369
    go: google.golang.org/[email protected] requires
    google.golang.org/[email protected] requires
    honnef.co/go/[email protected]: unrecognized import path "honnef.co/go/tools": reading https://honnef.co/go/tools?go-get=1: 502 Bad Gateway
    make: *** [Makefile:71: manpages] Error 1

For now, let's use the GOPROXY (we should look at making this a build-arg probably)

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

deb/Makefile

@@ -28,6 +28,7 @@ BUILD?=DOCKER_BUILDKIT=1 \
 RUN_FLAGS=
 RUN?=docker run --rm \
 	-e PLATFORM \
+	-e GOPROXY=https://proxy.golang.org \
 	-e EPOCH='$(EPOCH)' \
 	-e DEB_VERSION=$(word 1, $(GEN_DEB_VER)) \
 	-e VERSION=$(word 2, $(GEN_DEB_VER)) \

rpm/Makefile

@@ -50,6 +50,7 @@ RPMBUILD_FLAGS?=-ba\
 RUN_FLAGS=
 RUN?=docker run --rm \
 	-e PLATFORM \
+	-e GOPROXY=https://proxy.golang.org \
 	-v $(CURDIR)/rpmbuild/SOURCES:/root/rpmbuild/SOURCES:ro \
 	-v $(CURDIR)/rpmbuild/$@/RPMS:/root/rpmbuild/RPMS \
 	-v $(CURDIR)/rpmbuild/$@/SRPMS:/root/rpmbuild/SRPMS \