add github build

.github/workflows/build.yml

@@ -0,0 +1,61 @@
+name: build
+on: [push, pull_request]
+
+jobs:
+  ci:
+    runs-on: ${{ matrix.os }}
+    env:
+      #hardcode the coveralls token...it's not overly important to protect, and github actions won't allow forks to work with coveralls otherwise
+     COVERALLS_REPO_TOKEN: "RuXDcEBMUavqJgSdr5svlXWGDjrDEWFUI"
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, macos-10.15]
+        # os: [ubuntu-18.04, macos-10.15, windows-2019] - sorry windows.. maybe one day
+    steps:
+      - uses: actions/checkout@master
+      - uses: actions/setup-node@master
+        with:
+          node-version: "10.19.0"
+      - run: npm ci
+      - run: npm run build
+      # - run: npm run publish-coverage
+  npm-release:
+    #only run this task if a tag starting with 'v' was used to trigger this (i.e. a tagged release)
+    if: startsWith(github.ref, 'refs/tags/v')
+    needs: ci
+    runs-on: ubuntu-18.04
+    env:
+      NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+    steps:
+      - uses: actions/checkout@master
+      - uses: actions/setup-node@master
+        with:
+          node-version: "10.19.0"
+      - run: echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > ./.npmrc
+      - run: npm ci
+      - run: npm run build
+      #create npm package
+      - run: npm pack
+
+      #create GitHub release
+      - name: Create GitHub Release
+        id: create_release
+        uses: actions/create-release@latest
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          draft: false
+          prerelease: false #contains(github.ref, '-beta.') == true
+
+      #upload package to GitHub release
+      - name: Upload GitHub Release Assets
+        uses: alexellis/upload-assets@0.2.3
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          asset_paths: '["./*.tgz"]'
+
+      #upload to npm
+      - run: npm publish