docs: Added guide on Docker alternatives (#5053)

Signed-off-by: Vikram Vaswani <vikram@dagger.io>

docs/current/guides/541047-alternative-runtimes.md

@@ -0,0 +1,52 @@
+---
+slug: /541047/alternative-runtimes
+displayed_sidebar: 'current'
+category: "guides"
+tags: ["podman"]
+authors: ["Vikram Vaswani"]
+date: "2023-04-28"
+---
+
+# Use Dagger with Alternative OCI Runtimes
+
+## Introduction
+
+This guide explains how to use Dagger with various OCI-compatible Docker alternatives.
+
+## Podman
+
+### Requirements
+
+This guide assumes that you have Podman installed and running on the host system. If not, [install Podman](https://podman.io/getting-started/installation).
+
+### Configuration
+
+By default, Dagger tries to invoke the `docker` executable. To use Podman instead, create a symbolic link to the Podman executable in your system path and name it `docker`:
+
+```shell
+sudo ln -s $(which podman) /usr/local/bin/docker
+```
+
+:::note
+RHEL 8.x users may need to additionally execute `modprobe iptable_nat`.
+:::
+
+## Containerd (nerdctl)
+
+### Requirements
+
+This guide assumes that you have `nerdctl` installed and running on the host system in rootless mode. If not, [install the full release of `nerdctl`](https://github.com/containerd/nerdctl/releases) and [configure rootless mode](https://github.com/containerd/nerdctl/blob/main/docs/rootless.md).
+
+### Configuration
+
+By default, Dagger tries to invoke the `docker` executable. To use `nerdctl` instead, create a symbolic link to `nerdctl` in your system path and name it `docker`:
+
+```shell
+sudo ln -s $(which nerdctl) /usr/local/bin/docker
+```
+
+## Conclusion
+
+This guide explained how to use Dagger with various OCI-compatible Docker alternatives, such as Podman and `nerdctl`.
+
+Use the [API Key Concepts](../api/975146-concepts.mdx) page and the [Go](https://pkg.go.dev/dagger.io/dagger), [Node.js](../sdk/nodejs/reference/modules.md) and [Python](https://dagger-io.readthedocs.org/) SDK References to learn more about Dagger.