fix(connectivity_check): configure GitHub Packages registry for @janus.team scope

PLATEXP-11106

- Configure setup-node action to use GitHub Packages registry
- Add .npmrc to configure @janus.team scope registry
- Use NODE_AUTH_TOKEN environment variable for authentication
- This fixes the 404 error when installing @janus.team/janus-core

Author: sai-praveen-os

.github/workflows/build-lambda.yml

@@ -17,9 +17,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '22'
-      
-      - name: Configure npm authentication
-        run: echo "//registry.npmjs.org/:_authToken=${{ secrets.JANUS_NPM_TOKEN }}" > ~/.npmrc
+          registry-url: 'https://npm.pkg.github.com'
+          scope: '@janus.team'
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.JANUS_NPM_TOKEN }}
 
       - name: Build Lambda package
         run: |

modules/connectivity_check/lambda/.npmrc

@@ -0,0 +1,2 @@
+@janus.team:registry=https://npm.pkg.github.com
+//npm.pkg.github.com/:_authToken=${JANUS_NPM_TOKEN}