Update CI workflow to include getting version number from package.json

.github/workflows/ci.yml

@@ -33,6 +33,10 @@ jobs:
 
       - name: Run Unit tests
         run: yarn test --colors
+
+      - name: Get version number
+        id: version
+        run: echo 'VERSION=$(node -p "require('./package.json').version")' >> $GITHUB_ENV
 
   build-and-push:
     name: Build & push to DockerHub