Proposing Update to index.md - Env Settings for Rancher Desktop (#7591)

Co-authored-by: Eddú Meléndez Gonzales <eddu.melendez@gmail.com>
Co-authored-by: Kevin Wittek <kiview@users.noreply.github.com>

docs/supported_docker_environment/index.md

@@ -60,6 +60,34 @@ export TESTCONTAINERS_RYUK_DISABLED=true
     Previous to version 1.19.0, `export TESTCONTAINERS_RYUK_PRIVILEGED=true`
     was required for rootful mode. Starting with 1.19.0, this is no longer required.
 
+## Rancher Desktop
+
+In order to run testcontainers against [Rancher Desktop](https://rancherdesktop.io/) the env vars below should be set.
+
+If you're running Rancher Desktop as an administrator in a MacOS (M1) machine:
+
+Using QEMU emulation
+
+```bash
+export TESTCONTAINERS_HOST_OVERRIDE=$(rdctl shell ip a show rd0 | awk '/inet / {sub("/.*",""); print $2}')
+```
+
+Using VZ emulation
+
+```bash
+export TESTCONTAINERS_HOST_OVERRIDE=$(rdctl shell ip a show vznat | awk '/inet / {sub("/.*",""); print $2}')
+```
+
+If you're not running Rancher Desktop as an administrator in a MacOS (M1) machine:
+
+Using VZ emulation
+
+```bash
+export DOCKER_HOST=unix://$HOME/.rd/docker.sock
+export TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE=/var/run/docker.sock
+export TESTCONTAINERS_HOST_OVERRIDE=$(rdctl shell ip a show vznat | awk '/inet / {sub("/.*",""); print $2}')
+```
+
 ## Docker environment discovery
 
 Testcontainers will try to connect to a Docker daemon using the following strategies in order: