[enhance] skip docker build in hack/make.sh

[Letty5411]

Ⅰ. Issue Description

We may need to build a test image and push it to registry and use it directly in test.
As sometimes, CI may fail in docker build step as following:

# cd .; git clone https://go.googlesource.com/tools /go/src/golang.org/x/tools
Cloning into '/go/src/golang.org/x/tools'...
error: RPC failed; curl 56 GnuTLS recv error (-54): Error in the pull function.
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
package golang.org/x/tools/go/ast/astutil: exit status 128
package golang.org/x/tools/go/gcexportdata: cannot find package "golang.org/x/tools/go/gcexportdata" in any of:
	/usr/local/go/src/golang.org/x/tools/go/gcexportdata (from $GOROOT)
	/go/src/golang.org/x/tools/go/gcexportdata (from $GOPATH)
The command '/bin/sh -c go get -u golang.org/x/lint/golint' returned a non-zero code: 1
make: *** [integration-test] Error 1

Ⅱ. Describe what happened

Ⅲ. Describe what you expected to happen

Ⅳ. How to reproduce it (as minimally and precisely as possible)

Ⅴ. Anything else we need to know?

Ⅵ. Environment:

• pouch version (use pouch version):
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: