docs: add nerdctl manifest push reference

add nerdctl manifest push reference

Signed-off-by: ChengyuZhu6 <[email protected]>

Author: ChengyuZhu6

docs/command-reference.md

@@ -55,6 +55,7 @@ It does not necessarily mean that the corresponding features are missing in cont
   - [:whale: nerdctl manifest annotate](#whale-nerdctl-manifest-annotate)
   - [:whale: nerdctl manifest create](#whale-nerdctl-manifest-create)
   - [:whale: nerdctl manifest inspect](#whale-nerdctl-manifest-inspect)
+  - [:whale: nerdctl manifest push](#whale-nerdctl-manifest-push)
   - [:whale: nerdctl manifest rm](#whale-nerdctl-manifest-rm)
 - [Registry](#registry)
   - [:whale: nerdctl login](#whale-nerdctl-login)
@@ -1103,6 +1104,24 @@ nerdctl manifest inspect alpine:3.22.1
 nerdctl manifest inspect alpine@sha256:eafc1edb577d2e9b458664a15f23ea1c370214193226069eb22921169fc7e43f
 ```
 
+### :whale: nerdctl manifest push
+
+Push a manifest list to a registry.
+
+Usage: `nerdctl manifest push [OPTIONS] INDEX/MANIFESTLIST`
+
+Flags:
+
+- `--insecure`: Allow communication with an insecure registry
+- `--purge`: Remove the manifest list after pushing
+
+Examples:
+
+```bash
+# Push a manifest list to a registry
+nerdctl manifest push myapp:latest
+```
+
 ### :whale: nerdctl manifest rm
 
 Remove one or more index/manifest lists.