Update 15-agent-config.md (#1578)

Document DOCKER_HOST environment variable as described at #763
woodpecker-ci · Feb 10, 2023 · f71e623 · f71e623
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diff --git a/docs/versioned_docs/version-0.15/30-administration/15-agent-config.md b/docs/versioned_docs/version-0.15/30-administration/15-agent-config.md
@@ -79,6 +79,10 @@ See [Conditionals Pipeline](../20-usage/20-pipeline-syntax.md#step-when---condit
 ## All agent configuration options
 
 Here is the full list of configuration options and their default variables.
+#### `DOCKER_HOST` 
+> Default: empty 
+
+Point to an alternate socket file or host. For example, "unix:////run/podman/podman.sock"
 
 ### `WOODPECKER_SERVER`
 > Default: `localhost:9000`