feat: add setup action for use in GitHub workflows

.github/workflows/action.yaml

@@ -0,0 +1,20 @@
+name: Test actions/setup
+
+on:
+  push:
+    paths:
+      - actions/**
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+      - name: Setup scout
+        uses: ./actions/setup
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - run: scout --version

actions/setup/README.md

@@ -0,0 +1,9 @@
+# Scout Setup Action
+
+This is a GitHub Workflow Action to setup @glasskube/scout.
+
+## Inputs
+
+- `token` (required): The GitHub Token used to authenticate against the GitHub package registry.
+  You can use ${{ secrets.GITHUB_TOKEN }} or a custom personal access token.
+  It does not need any special permissions.

actions/setup/action.yaml

@@ -0,0 +1,21 @@
+name: Setup @glasskube/scout
+description: Install @glasskube/scout globally using npm
+inputs:
+  token:
+    required: true
+    description: GitHub Token for NPM registry
+outputs: {}
+runs:
+  using: "composite"
+  steps:
+    - name: Setup node.js
+      uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4
+      with:
+        node-version: "20"
+        registry-url: "https://npm.pkg.github.com"
+        scope: "@glasskube"
+    - name: Install scout
+      shell: sh
+      run: npm install -g @glasskube/scout
+      env:
+        NODE_AUTH_TOKEN: ${{ inputs.token }}