Update the CI workflow

.github/workflows/ci.yaml

@@ -7,7 +7,7 @@ on:
   pull_request:
     paths_ignore: ["**.md"]
   schedule:
-  - cron: "0 0 * * *"
+  - cron: "0 0 1 * *"
 
 jobs:
   test:
@@ -16,12 +16,12 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
     steps:
-    - uses: actions/checkout@v2
-    - uses: asdf-vm/actions/plugin-test@v1
+    - uses: actions/checkout@v4
+    - uses: asdf-vm/actions/plugin-test@v3
       with:
         command: clusterctl version
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - run: make lint

Makefile

@@ -1,3 +1,3 @@
 .PHONY: lint
 lint:
-		shellcheck bin/*
+	shellcheck bin/*

README.md

@@ -1,7 +1,5 @@
 # asdf-clusterctl
 
-[![CI](https://github.com/pfnet-research/asdf-clusterctl/workflows/CI/badge.svg)](https://github.com/pfnet-research/asdf-clusterctl/actions?query=workflow%3ACI)
-
 This repository contains [clusterctl](https://github.com/kubernetes-sigs/cluster-api) plugin for the [asdf](https://github.com/asdf-vm/asdf) version manager.
 
 The clusterctl CLI tool handles the lifecycle of a Cluster API management cluster. The Cluster API is a Kubernetes project to bring declarative, Kubernetes-style APIs to cluster creation, configuration, and management.
@@ -11,7 +9,7 @@ See [Introduction \- The Cluster API Book](https://cluster-api.sigs.k8s.io/) for
 ## Install
 
 ```
-asdf plugin-add clusterctl https://github.com/pfnet-research/asdf-clusterctl.git
+asdf plugin add clusterctl https://github.com/pfnet-research/asdf-clusterctl.git
 ```
 
 See https://asdf-vm.com/ for more detail on asdf-vm.