Workflow to publish a dev release

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Publish
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  publish-npm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+          registry-url: https://registry.npmjs.org/
+      - name: Install dependencies
+        run: npm ci
+      - name: Publish
+        run: |
+          VERSION=$(npx semver $(npm view ol@dev version) --increment prerelease --preid dev)
+          npm --no-git-tag-version version ${VERSION}
+          npm run build-package
+          cd build/ol
+          npm publish --tag dev
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}