Setting npm registry url for publishing

.github/workflows/main.yml

@@ -22,20 +22,17 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        node-version: [12.x]
-
     steps:
     - name: Branch name
       if: startsWith(github.ref, 'refs/tags/')
       id: branch_name
       run: echo ::set-output name=SOURCE_TAG::${GITHUB_REF#refs/tags/}
     - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
+    # Setup .npmrc file to publish to npm
+    - uses: actions/setup-node@v1
       with:
-        node-version: ${{ matrix.node-version }}
+        node-version: '12.x'
+        registry-url: 'https://registry.npmjs.org'
     - name: Bump version number locally on tag
       if: startsWith(github.ref, 'refs/tags/')
       run: npm version --no-git-tag-version $SOURCE_TAG