conduit/CROSS_COMPILE.md

Install docker:
```
$ sudo apt install docker
$ sudo usermod -aG docker $USER
$ exec sudo su -l $USER
$ sudo systemctl start docker
$ cargo install cross
$ cross build --release --features tls_vendored --target armv7-unknown-linux-musleabihf
```
The cross-compiled binary is at target/armv7-unknown-linux-musleabihf/release/conduit
docs: cross compile 2020-10-17 23:48:31 -07:00			`Install docker:`
No need to log out and back in fix 2021-04-02 15:11:14 -07:00			```
docs: cross compile 2020-10-17 23:48:31 -07:00			`$ sudo apt install docker`
			`$ sudo usermod -aG docker $USER`
No need to log out and back in fix 2021-04-02 15:11:14 -07:00			`$ exec sudo su -l $USER`
docs: cross compile 2020-10-17 23:48:31 -07:00			`$ sudo systemctl start docker`
			`$ cargo install cross`
			`$ cross build --release --features tls_vendored --target armv7-unknown-linux-musleabihf`
No need to log out and back in fix 2021-04-02 15:11:14 -07:00			```
docs: cross compile 2020-10-17 23:48:31 -07:00			`The cross-compiled binary is at target/armv7-unknown-linux-musleabihf/release/conduit`