diff --git a/.github/workflows/build-docker-image.yaml b/.github/workflows/build-docker-image.yaml
index 76ae36ead..d3b6f3a0f 100644
--- a/.github/workflows/build-docker-image.yaml
+++ b/.github/workflows/build-docker-image.yaml
@@ -2,7 +2,7 @@ name: build-docker-image
 
 on:
   push:
-    branches: [develop]
+    branches: [thorsteneckel-debug-docker-image-build]
 
 jobs:
   build-docker-image:
diff --git a/lib/tasks/zammad/ci/refresh_envs.rake b/lib/tasks/zammad/ci/refresh_envs.rake
index 10ce64d8d..a264b7a9d 100644
--- a/lib/tasks/zammad/ci/refresh_envs.rake
+++ b/lib/tasks/zammad/ci/refresh_envs.rake
@@ -1,5 +1,3 @@
-require 'dotenv'
-
 namespace :zammad do
 
   namespace :ci do
@@ -7,6 +5,10 @@ namespace :zammad do
     desc 'Re-fresh-es dynamic ENV variables'
     task refresh_envs: :environment do
 
+      # require only at runtime of process to avoid errors when loading
+      # rake tasks in production without this gem installed
+      require 'dotenv'
+
       Dotenv.overload('fresh.env')
 
       result = ExternalCredential::Microsoft365.refresh_token(