Add Docker template example documentation

Add a new template example showing how to create a sandbox with Docker
installed. Uses the official get.docker.com script for installation
and validates with hello-world during build.

Author: beran-t

docs.json

@@ -120,7 +120,8 @@
                   "docs/template/examples/nextjs-bun",
                   "docs/template/examples/expo",
                   "docs/template/examples/desktop",
-                  "docs/template/examples/claude-code"
+                  "docs/template/examples/claude-code",
+                  "docs/template/examples/docker"
                 ]
               },
               "docs/template/migration-v2",

docs/template/examples/docker.mdx

@@ -0,0 +1,88 @@
+---
+title: "Docker"
+description: "Sandbox with Docker installed for running containers"
+---
+
+Run Docker containers inside the E2B sandbox. Docker daemon is managed by systemd and starts automatically.
+
+## Install Docker
+
+Use the official installation script from [get.docker.com](https://get.docker.com) to set up Docker. The `hello-world` container validates that everything works.
+
+<CodeGroup>
+```typescript JavaScript & TypeScript
+// template.ts
+import { Template } from 'e2b'
+
+export const template = Template()
+  .fromUbuntuImage('25.04')
+  .runCmd('curl -fsSL https://get.docker.com | sudo sh')
+  .runCmd('sudo docker run --rm hello-world')
+```
+
+```python Python
+# template.py
+from e2b import Template
+
+template = (
+    Template()
+    .from_ubuntu_image("25.04")
+    .run_cmd("curl -fsSL https://get.docker.com | sudo sh")
+    .run_cmd("sudo docker run --rm hello-world")
+)
+```
+</CodeGroup>
+
+## Build and publish
+
+Build the template with enough resources for Docker operations.
+
+<CodeGroup>
+```typescript JavaScript & TypeScript
+// build.ts
+import { Template, defaultBuildLogger } from 'e2b'
+import { template as dockerTemplate } from './template'
+
+await Template.build(dockerTemplate, 'e2b-docker-template', {
+  cpuCount: 2,
+  memoryMB: 2048,
+  onBuildLogs: defaultBuildLogger(),
+})
+```
+
+```python Python
+# build.py
+from e2b import Template, default_build_logger
+from .template import template as dockerTemplate
+
+Template.build(dockerTemplate, 'e2b-docker-template',
+    cpu_count=2,
+    memory_mb=2048,
+    on_build_logs=default_build_logger(),
+)
+```
+</CodeGroup>
+
+## Run containers
+
+Spin up a sandbox and run any Docker image you need.
+
+<CodeGroup>
+```typescript JavaScript & TypeScript
+import { Sandbox } from 'e2b'
+
+const sandbox = await Sandbox.create('e2b-docker-template', { timeoutMs: 60_000 })
+
+const result = await sandbox.commands.run('sudo docker run --rm alpine echo "Hello from Alpine!"')
+console.log(result.stdout)
+```
+
+```python Python
+from e2b import Sandbox
+
+sandbox = Sandbox.create('e2b-docker-template', timeout=60)
+
+result = sandbox.commands.run('sudo docker run --rm alpine echo "Hello from Alpine!"')
+print(result.stdout)
+```
+</CodeGroup>