ci(manual-release): fix EXTRA_FEATURES not being passed correctly (#912)

Author: SanchithHegde

.github/workflows/manual-release.yml

@@ -34,14 +34,14 @@ jobs:
 
       - name: Add multiple_mca feature if enabled
         if: ${{ inputs.multiple_mca == true }}
-        run: echo "--features multiple_mca" >> EXTRA_FEATURES
+        run: echo 'EXTRA_FEATURES="--features multiple_mca"' >> $GITHUB_ENV
 
       - name: Build and push router Docker image
         uses: docker/build-push-action@v4
         with:
           build-args: |
             RUN_ENV=${{ inputs.environment }}
-            EXTRA_FEATURES=EXTRA_FEATURES
+            EXTRA_FEATURES=${{ env.EXTRA_FEATURES }}
             BINARY=router
           context: .
           push: true