Add production-immutable-stg branch into CI

.github/workflows/config.yml

@@ -12,6 +12,7 @@ on:
       - production-sokol-stg
       - production-rsk-stg
       - production-lukso-stg
+      - production-immutable-stg
       - staging-l2
   pull_request:
     branches:

.github/workflows/publish-docker-image-release.yml

@@ -82,6 +82,7 @@ jobs:
         production-xdai-stg
         production-polygon-supernets-stg
         production-rsk-stg
+        production-immutable-stg
     steps:
     - uses: actions/checkout@v2
     - name: Set Git config