initial

.github/workflows/nodejs.yml

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+name: 'build-test'
+on: # rebuild any PRs and main branch changes
+  pull_request:
+  push:
+    branches:
+      - main
+      - 'releases/*'
+
+jobs:
+  build: # make sure build/ci work properly
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          yarn
+  test: # make sure the action works on a clean machine without building
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        id: cpu-count
+      - run: echo ${{ steps.cpu-count.outputs.count }}

.gitignore

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+node_modules/

action.yml

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+name: "CPU Core Count"
+description: "Get the number of available cores on the runner"
+outputs:
+  count:
+    description: "The count of available CPU cores"
+runs:
+  using: "node12"
+  main: "dist/index.js"