Vault cannot mount plugin: no such file or directory

I am using the latest version of stepwise the docker environment.

Stepwise is set up as follows:
```go
envOptions := &stepwise.MountOptions{
RegistryName: "myplugin",
PluginType: api.PluginTypeSecrets,
PluginName: "vault-plugin-secrets-myplugin",
MountPathPrefix: "myplugin",
}

roleName := "vault-stepwise-user-role"
cred := new(string)
stepwise.Run(t, stepwise.Case{
Precheck: func() { testAccPreCheck(t) },
Environment: dockerEnvironment.NewEnvironment("myplugin", envOptions),
Steps: []stepwise.Step{
testAccConfig(t),
testAccUserRole(t, roleName),
testAccUserRoleRead(t, roleName),
testAccUserCredRead(t, roleName, cred),
},
})
```
Stepwise fails to start with the following error:
```
stepwise_test.go:40: Error making API request.

URL: POST https://127.0.0.1:32768/v1/sys/mounts/myplugin_4818a767-82c9-3e51-d6d3-34b12a1ec883
Code: 400. Errors:

* invalid backend version: 2 errors occurred:
* fork/exec /vault/config/vault-plugin-myplugin: no such file or directory
* fork/exec /vault/config/vault-plugin-myplugin: no such file or directory
```

When I enter the docker container, I confirmed that `/vault/config/vault-plugin-myplugin` exists and is the right size.

Wondering if this is because the plugin is built on Ubuntu, but the Vault image uses alpine linux, leading to some compatibility problems.

I think [CompilePlugin](https://github.com/hashicorp/vault-testing-stepwise/blob/main/helpers.go#L29) needs to build the plugin statically and with CGO disabled.