chore: add release-please github action (#112)

Author: dyladan

.github/workflows/release-please.yml

@@ -0,0 +1,33 @@
+on:
+  push:
+    branches:
+      - main
+name: release-please
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: GoogleCloudPlatform/release-please-action@v2
+        id: release
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          release-type: node
+          package-name: "@opentelemetry/api"
+      # The logic below handles the npm publication:
+      - uses: actions/checkout@v2
+        # these if statements ensure that a publication only occurs when
+        # a new release is created:
+        if: ${{ steps.release.outputs.release_created }}
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 14
+          registry-url: 'https://registry.npmjs.org'
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm install
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm run compile
+        if: ${{ steps.release.outputs.release_created }}
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+        if: ${{ steps.release.outputs.release_created }}

.gitignore

@@ -1,3 +1,6 @@
+# version.ts file is autogenerated at compile time
+src/version.ts
+
 # Logs
 logs
 *.log

package.json

@@ -12,10 +12,10 @@
   },
   "repository": "https://github.com/open-telemetry/opentelemetry-js-api.git",
   "scripts": {
-    "build": "npm run compile",
     "clean": "tsc --build --clean tsconfig.json tsconfig.esm.json",
     "codecov:browser": "nyc report --reporter=json && codecov -f coverage/*.json -p .",
     "codecov": "nyc report --reporter=json && codecov -f coverage/*.json -p .",
+    "precompile": "npm run version",
     "compile": "tsc --build tsconfig.json tsconfig.esm.json",
     "docs": "typedoc",
     "docs:deploy": "gh-pages --dist docs/out",
@@ -25,6 +25,7 @@
     "test:browser": "nyc karma start --single-run",
     "test": "nyc ts-mocha -p tsconfig.json test/**/*.test.ts",
     "version": "node scripts/version-update.js",
+    "prewatch": "npm run version",
     "watch": "tsc --build --watch"
   },
   "keywords": [