docs: Added a note about terraform

Requiring gcloud auth application-default login when using the browser based login

Author: dploeger

README.md

@@ -554,6 +554,10 @@ Installs and configures [Terraform](https://terraform.io)
   than the default is used, the volume-target needs to be adapted to the same directory
 * Environment TERRAFORM_CREDENTIALS_PATH: Volume target for terraform credentials (optional). Defaults to `/terraform`. If something 
   different than the default is used, the volume-target needs to be adapted to the same directory
+* If you used the browser based login in gcloud, you'll probably need to authenticate using the application-default
+  login using the gcloud cli by running
+  
+      gcloud auth application-default login
 
 ### <a id="terragrunt"></a> Terragrunt
 
@@ -770,7 +774,3 @@ flowchart TD
     click F "https://github.com/dodevops/cloudcontrol/blob/develop/.github/workflows/test.yml" "Test workflow"
     click H "https://github.com/dodevops/cloudcontrol/blob/develop/.github/workflows/release.yml" "Release workflow"
 ```mermaid
-github.com/dodevops/cloudcontrol/blob/develop/.github/workflows/release.yml" "Release workflow"
-```mermaid
-maid
-

feature/terraform/feature.yaml

@@ -21,3 +21,8 @@ configuration:
     - |
         Environment TERRAFORM_CREDENTIALS_PATH: Volume target for terraform credentials (optional). Defaults to `/terraform`. If something 
         different than the default is used, the volume-target needs to be adapted to the same directory
+    - |
+        If you used the browser based login in gcloud, you'll probably need to authenticate using the application-default
+        login using the gcloud cli by running
+        
+            gcloud auth application-default login