Dockerfile-test: add 'ineffassign' to image
Was missing for 'fmt' tests.
@@ -20,6 +20,7 @@ RUN go get -v -u -tags spell github.com/chzchzchz/goword \
&& go get -v -u honnef.co/go/tools/cmd/unused \
&& go get -v -u honnef.co/go/tools/cmd/staticcheck \
&& go get -v -u github.com/wadey/gocovmerge \
+ && go get -v -u github.com/gordonklaus/ineffassign \
&& ./scripts/install-marker.sh amd64
# e.g.
