Docker build does not work on Apple Mac m1 chip arm64

Couldn't install with go get either
The Docker example does not work for my Mac M1 chip

Getting this error:
```
(venv) jchan2@AU-F9DJ5W25WC ~ % cd $GOPATH/src/github.com/go-python/gopy/_examples/hi
(venv) jchan2@AU-F9DJ5W25WC hi % docker run --rm -v `pwd`:/go/src/in -v `pwd`:/out gopy/gopy app bind -output=/out in
Unable to find image 'gopy/gopy:latest' locally
latest: Pulling from gopy/gopy
ad74af05f5a2: Pull complete
2b032b8bbe8b: Pull complete
a9a5b35f6ead: Pull complete
25d9840c55bc: Pull complete
d792ec7d64a3: Pull complete
be556a93c22e: Pull complete
3a5fce283a1e: Pull complete
0621865a0c2e: Pull complete
81b0c7b4a330: Pull complete
3860d4cacc02: Pull complete
ddfc9a678375: Pull complete
15d8e4fdf38a: Pull complete
Digest: sha256:2af5d39cfa04efb10333022599a0f007b9aa4db2f3c967c3622f46e3a9844724
Status: Downloaded newer image for gopy/gopy:latest
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
runtime: failed to create new OS thread (have 2 already; errno=22)
fatal error: newosproc

runtime stack:
runtime.throw(0x6fa581, 0x9)
/usr/local/go/src/runtime/panic.go:596 +0x95
runtime.newosproc(0xc42002a000, 0xc42003a000)
/usr/local/go/src/runtime/os_linux.go:163 +0x18c
runtime.newm(0x70fe68, 0x0)
/usr/local/go/src/runtime/proc.go:1628 +0x137
runtime.main.func1()
/usr/local/go/src/runtime/proc.go:126 +0x36
runtime.systemstack(0x851700)
/usr/local/go/src/runtime/asm_amd64.s:327 +0x79
runtime.mstart()
/usr/local/go/src/runtime/proc.go:1132

goroutine 1 [running]:
runtime.systemstack_switch()
/usr/local/go/src/runtime/asm_amd64.s:281 fp=0xc420026788 sp=0xc420026780
runtime.main()
/usr/local/go/src/runtime/proc.go:127 +0x6c fp=0xc4200267e0 sp=0xc420026788
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2197 +0x1 fp=0xc4200267e8 sp=0xc4200267e0
```

首先，在 Apple M1 arm64 主机上复现 _examples/hi 中的 Docker 命令，并检查示例使用的 gopy/gopy 镜像。将报告的平台警告和 Go 运行时失败与 Docker 示例设置进行比较；完成标准是示例能够在 arm64 上成功运行且不出现 newosproc 失败。

由索引模型根据 Issue 内容生成。