Increment to V2 in Dockerfile and Makefile (#3272)

Dockerfile

@@ -20,7 +20,7 @@ RUN go mod tidy
 RUN go mod vendor
 ARG TEST="true"
 RUN if [ "$TEST" != "false" ]; then ./validate.sh ; fi
-RUN go build -mod=vendor -ldflags "-X github.com/prebid/prebid-server/version.Ver=`git describe --tags | sed 's/^v//'` -X github.com/prebid/prebid-server/version.Rev=`git rev-parse HEAD`" .
+RUN go build -mod=vendor -ldflags "-X github.com/prebid/prebid-server/v2/version.Ver=`git describe --tags | sed 's/^v//'` -X github.com/prebid/prebid-server/v2/version.Rev=`git rev-parse HEAD`" .
 
 FROM ubuntu:20.04 AS release
 LABEL maintainer="[email protected]" 

Makefile

@@ -15,7 +15,7 @@ test: deps
 ifeq "$(adapter)" ""
 	./validate.sh
 else
-	go test github.com/prebid/prebid-server/adapters/$(adapter) -bench=.
+	go test github.com/prebid/prebid-server/v2/adapters/$(adapter) -bench=.
 endif
 
 # build-modules generates modules/builder.go file which provides a list of all available modules
@@ -32,4 +32,4 @@ image:
 
 # format runs format
 format:
-	./scripts/format.sh -f true
+	./scripts/format.sh -f true