Add plugin to temporarily scale down/up all deployments, statefulsets, and daemonsets in a namespace using szero (#3259)

* Add plugin to temporarily scale down/up all deployments, statefulsets, and daemonsets in a namespace using szero

* Add szero to documentation readme

---------

Co-authored-by: Fernand Galiana <fernand.galiana@gmail.com>

plugins/README.md

@@ -5,7 +5,7 @@ K9s plugins extend the tool to provide additional functionality via actions to f
 Following is an example of some plugin files in this directory. Other files are not listed in this table.
 
 | Plugin-Name                    | Description                                                                  | Available on Views                  | Shortcut  | Kubectl plugin, external dependencies                                                 |
-| ------------------------------ | ---------------------------------------------------------------------------- | ----------------------------------- |-----------| ------------------------------------------------------------------------------------- |
+|--------------------------------| ---------------------------------------------------------------------------- |-------------------------------------|-----------|---------------------------------------------------------------------------------------|
 | ai-incident-investigation.yaml | Run AI investigation on application issues to find the root cause in seconds | all                                 | Shift-h/o | [HolmesGPT](https://github.com/robusta-dev/holmesgpt)                                 |
 | argocd.yaml                    | Perform argocd operation quickly                                             | applications                        | Shift-r   | [ArgoCD](https://argo-cd.readthedocs.io/en/stable/getting_started/)                   |
 | debug-container.yaml           | Add [ephemeral debug container](1)<br>([nicolaka/netshoot](2))               | containers                          | Shift-d   |                                                                                       |
@@ -21,6 +21,7 @@ Following is an example of some plugin files in this directory. Other files are
 | log-bunyan.yaml                | View pods, service, deployment logs using bunyan                             | pods, service, deployment           | Ctrl-l    | [Bunyan](https://www.npmjs.com/package/bunyan)                                        |
 | log-full.yaml                  | get full logs from pod/container                                             | pods/containers                     | Ctrl-l    |                                                                                       |
 | resource-recommendations.yaml  | View recommendations for CPU/Memory requests based on historical data        | deployments/daemonsets/statefulsets | Shift-k   | [Robusta KRR](https://github.com/robusta-dev/krr)                                     |
+| szero.yaml                     | Temporarily scale down/up all deployments, statefulsets, and daemonsets      | namespaces                          | Shift-d/u | [szero](https://github.com/jadolg/szero)                                              |
 | trace-dns.yaml                 | Trace DNS resolution using Inspektor Gadget (4)                              | containers/pods/nodes               | Shift-d   |                                                                                       |
 | vector-dev-top.yaml            | Run `vector top` in vector.dev container                                     | pods/container                      | h         | [vector top](https://vector.dev/highlights/2020-12-23-vector-top/)                    |
 

plugins/szero.yaml

@@ -0,0 +1,28 @@
+# Temporarily scale down/up all deployments, statefulsets, and daemonsets in a namespace using szero
+# Uses https://github.com/jadolg/szero
+
+plugins:
+  szero-down:
+    shortCut: Shift-D
+    confirm: true
+    dangerous: true
+    description: Scale all down
+    scopes:
+      - namespace
+    command: sh
+    background: false
+    args:
+      - -c
+      - "szero down --context $CONTEXT --namespace $NAME"
+  szero-up:
+    shortCut: Shift-U
+    confirm: true
+    dangerous: true
+    description: Scale all up
+    scopes:
+      - namespace
+    command: sh
+    background: false
+    args:
+      - -c
+      - "szero up --context $CONTEXT --namespace $NAME"