How could I modify the files in oss-fuzz/infra/base-images/base-builder, such as compile_go_fuzzer and apply it to the compilation? When I run the command line in https://github.com/istio/istio/tree/master/tests/fuzz/README.md :

python infra/helper.py build_fuzzers istio ~/go/src/istio.io/istio

There are something wrong during the running time. In istio.io/istio/tests/fuzz/oss_fuzz_build.sh, some commands are like:

compile_go_fuzzer istio.io/istio/tests/fuzz func1 func2

I set my GOPATH=$HOME/go. In oss-fuzz/infra/base-images/base-builder/compile_go_fuzzer, there are some $GOPATH to directly find the position of go sources. However, as I run compile_go_fuzzer istio.io/istio/tests/fuzz func1 func2, the output is like, for example:
/usr/local/bin/compile_go_fuzzer: line 28: cd: /root/go/src/istio.io/istio/tests/fuzz: No such file or directory
istio.io/istio/tests/fuzz
istio.io/istio/tests/fuzz
Running go-fuzz -tags gofuzz -func FuzzNewBootstrapServer -o fuzz_new_bootstrap_server.a istio.io/istio/tests/fuzz
So I'm comfused about this. How to modify the compile_go_fuzzer and apply the modification into the compilation?