Add release workflow

Author: znicholasbrown

.github/workflows/release.yml

@@ -0,0 +1,63 @@
+name: Release
+
+on:
+  push:
+    paths: 
+      - package.json
+    branches:
+      - main
+
+jobs:
+
+  version-change-check:
+    name: Check Package Version
+    runs-on: ubuntu-latest
+
+    steps: 
+      - uses: actions/checkout@v1
+
+      - name: Check Package Version
+        uses: EndBug/version-check@v1
+        id: check
+
+      - name: Cancel
+        if: steps.check.outputs.changed == 'false'
+        uses: andymckay/[email protected]
+
+  build-and-publish:
+    name: Build & Publish Release
+    runs-on: ubuntu-latest
+    needs: [version-change-check]
+    environment: 'prod'
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Read .nvmrc
+        run: echo "##[set-output name=NVMRC;]$(cat .nvmrc)"
+        id: nvm
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "${{ steps.nvm.outputs.NVMRC }}"
+      
+      - name: Install dependencies
+        run: npm ci install
+      
+      - name: Build package
+        run: npm run build
+
+      - name: Publish Package
+        id: publish
+        uses: JS-DevTools/npm-publish@v1
+        with:
+          token: ${{ secrets.NPM_PUBLISH_TOKEN }}
+          access: public
+
+      - name: Create Release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ steps.publish.outputs.version }}
+          release_name: Release ${{ steps.publish.outputs.version }}