(makefile) Dynamically set GOARCH flag while building binaries

The GOARCH flag was hardcoded to "386", which causes the binaries to not
work properly on machines with arm64 arch. This PR dynamically sets the
GOARCH flag instead of hardcoding to a particular value.

Makefile

@@ -14,6 +14,7 @@ PKG   := $(ORG)/operator-lifecycle-manager
 MOD_FLAGS := $(shell (go version | grep -q -E "1\.1[1-9]") && echo -mod=vendor)
 BUILD_TAGS := "json1"
 CMDS  := $(shell go list $(MOD_FLAGS) ./cmd/...)
+ARCH := $(shell arch)
 TCMDS := $(shell go list $(MOD_FLAGS) ./test/e2e/...)
 MOCKGEN := ./scripts/update_mockgen.sh
 CODEGEN := ./scripts/update_codegen.sh
@@ -82,15 +83,15 @@ build-coverage: build_cmd=test -c -covermode=count -coverpkg ./pkg/controller/..
 build-coverage: clean $(CMDS)
 
 build-linux: build_cmd=build
-build-linux: arch_flags=GOOS=linux GOARCH=386
+build-linux: arch_flags=GOOS=linux GOARCH=$(ARCH)
 build-linux: clean $(CMDS)
 
 build-wait: clean bin/wait
 
 bin/wait: FORCE
-	GOOS=linux GOARCH=386 go build $(MOD_FLAGS) -o $@ $(PKG)/test/e2e/wait
+	GOOS=linux GOARCH=$(ARCH) go build $(MOD_FLAGS) -o $@ $(PKG)/test/e2e/wait
 
-build-util-linux: arch_flags=GOOS=linux GOARCH=386
+build-util-linux: arch_flags=GOOS=linux GOARCH=$(ARCH)
 build-util-linux: build-util
 
 build-util: bin/cpb