Automate publishing (#8)

Author: fregante

.github/workflows/npm-publish.yml

@@ -0,0 +1,33 @@
+# Collaborators can publish a new version **of what's on master** by leaving a review on any PR, generally the PR that just closed.
+# To trigger this, the comment must match the format `🚀 version`, where "version" is anything accepted by `npm version XXX`
+
+name: Publish
+
+on:
+  pull_request_review:
+    types:
+      - submitted
+
+jobs:
+
+  npm:
+    runs-on: ubuntu-latest
+    if: contains('OWNER,COLLABORATOR', github.event.review.author_association) && startsWith(github.event.review.body, '🚀')
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: master
+      - run: npm install
+      - uses: fregante/setup-git-token@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - name: npm version
+        run: |
+          WORDS=($COMMENT)
+          npm version ${WORDS[1]}
+        env:
+          COMMENT: ${{ github.event.review.body }}
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.npm_token}}
+      - run: git push --follow-tags