Added various NPM scripts.

npm/npm-install/action.yaml

@@ -0,0 +1,36 @@
+name: npm-install
+description: "Download the desired NPM package tarball."
+inputs:
+  name:
+    description: "Name of the package."
+    required: true
+  version:
+    description: "Version of the package."
+    required: false
+    default: ""
+  prerelease:
+    description: "Install prerelease packages. Values: true, false."
+    required: false
+    default: "false"
+  outputDirectory:
+    description: "Directory for the output file."
+    required: true
+    default: "."
+  registry:
+    description: "NPM registry URL."
+    required: false
+    default: "https://npm.pkg.github.com"
+  authToken:
+    description: "Authentication token for the registry."
+    required: true
+outputs:
+  tgz:
+    description: "The path to the .tgz file."
+    value: ${{ steps.download.outputs.tgz }}
+runs:
+  using: "composite"
+  steps:
+  - name: "Download the package."
+    id: download
+    run: bash ${{ github.action_path }}/download_package.sh "${{ inputs.name }}" "${{ inputs.version }}" "${{ inputs.registry }}" "${{ inputs.authToken }}" "${{ inputs.outputDirectory }}"
+    shell: bash