[zcash/zcash] Test mirror for sandbox hook (#3464)

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### Describe the issue
Please provide a general summary of the issue you’re experiencing

### Can you reliably reproduce the issue?
#### If so, please list the steps to reproduce below:

### Expected behaviour
Tell us what should happen

### Actual behaviour + errors
Tell us what happens instead including any noticable error output (any messages displayed on-screen when e.g. a crash occurred)

### The version of Zcash you were using:
Run `zcashd —version` to find out

### Machine specs:
— OS name + version:
— CPU:
— RAM:
— Disk size:
— Disk Type (HD/SDD):
— Linux kernel version (uname -a):
— Compiler version (gcc -version):

### Any extra information that might be useful in the debugging process.
This includes the relevant contents of `~/.zcash/debug.log`. You can paste raw text, attach the file directly in the issue or link to the text via a pastebin type site.
Please also include any non-standard things you did during compilation (extra flags, dependency version changes etc.) if applicable.

### Do you have a backup of `~/.zcash` directory and/or take a VM snapshot?
— Backing up / making a copy of the `~/.zcash` directory might help make the problem reproducible. Please redact appropriately.
— Taking a VM snapshot is really helpful for interactively testing fixes

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