Makefile: go-mod-vendor: fix copying of gogo/protobuf

[thaJeztah]

• relates to update to go 1.18 #3070

Possibly it's using a non-standard location;

cp: cannot stat '/home/circleci/.go_workspace:/usr/local/go_workspace/pkg/mod/github.com/gogo/protobuf@v1.3.2/protobuf': No such file or directory
make: *** [direct.mk:146: go-mod-vendor] Error 1

So, using GOMODCACHE path instead of trying to construct our own.

[thaJeztah]

Hm... flaky test?

--- FAIL: TestRaftRestartClusterSimultaneously (12.22s)
    testutils.go:97: 
        	Error Trace:	testutils.go:97
        	            				raft_test.go:626
        	            				raft_test.go:664
        	Error:      	Received unexpected error:
        	            	did not find a ready leader in member list
        	            	github.com/moby/swarmkit/v2/manager/state/raft/testutils.WaitForCluster.func1
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/manager/state/raft/testutils/testutils.go:74
        	            	github.com/moby/swarmkit/v2/testutils.PollFuncWithTimeout
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/testutils/poll.go:22
        	            	github.com/moby/swarmkit/v2/testutils.PollFunc
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/testutils/poll.go:36
        	            	github.com/moby/swarmkit/v2/manager/state/raft/testutils.WaitForCluster
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/manager/state/raft/testutils/testutils.go:60
        	            	github.com/moby/swarmkit/v2/manager/state/raft_test.testRaftRestartCluster
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/manager/state/raft/raft_test.go:626
        	            	github.com/moby/swarmkit/v2/manager/state/raft_test.TestRaftRestartClusterSimultaneously
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/manager/state/raft/raft_test.go:664
        	            	testing.tRunner
        	            		/usr/local/go/src/testing/testing.go:1259
        	            	runtime.goexit
        	            		/usr/local/go/src/runtime/asm_amd64.s:1581
        	            	polling failed
        	            	github.com/moby/swarmkit/v2/testutils.PollFuncWithTimeout
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/testutils/poll.go:28
        	            	github.com/moby/swarmkit/v2/testutils.PollFunc
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/testutils/poll.go:36
        	            	github.com/moby/swarmkit/v2/manager/state/raft/testutils.WaitForCluster
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/manager/state/raft/testutils/testutils.go:60
        	            	github.com/moby/swarmkit/v2/manager/state/raft_test.testRaftRestartCluster
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/manager/state/raft/raft_test.go:626
        	            	github.com/moby/swarmkit/v2/manager/state/raft_test.TestRaftRestartClusterSimultaneously
        	            		/home/circleci/.go_workspace/src/github.com/docker/swarmkit/manager/state/raft/raft_test.go:664
        	            	testing.tRunner
        	            		/usr/local/go/src/testing/testing.go:1259
        	            	runtime.goexit
        	            		/usr/local/go/src/runtime/asm_amd64.s:1581
        	Test:       	TestRaftRestartClusterSimultaneously
FAIL

[codecov-commenter]

Codecov Report

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The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #3088   +/-   ##
=========================================
  Coverage          ?   62.03%           
=========================================
  Files             ?      156           
  Lines             ?    24618           
  Branches          ?        0           
=========================================
  Hits              ?    15271           
  Misses            ?     7751           
  Partials          ?     1596           

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[thaJeztah]

Thx! Let me bring this one in