🧹 Remove unused environment variable from workflow

- Remove unused 'environment' workflow_dispatch input
- Remove unused 'environment' job-level environment variable
- Clean up workflow to only include variables that are actually used
- Keep only the 'domain' input which is actually referenced in the workflow

Author: yassinsws

.github/workflows/deploy-kubernetes.yml

@@ -10,14 +10,6 @@ on:
       - 'infra/helm/**'
   workflow_dispatch:
     inputs:
-      environment:
-        description: 'Deployment environment'
-        required: true
-        default: 'dev'
-        type: choice
-        options:
-        - dev
-        - prod
       domain:
         description: 'Domain name for deployment'
         required: true
@@ -26,14 +18,13 @@ on:
 jobs:
   deploy-kubernetes:
     runs-on: ubuntu-latest
-    environment: ${{ github.event.inputs.environment || 'dev' }}
 
     env:
       HELM_NAMESPACE: studymate
       DOMAIN: ${{ github.event.inputs.domain || 'studymate.student.k8s.aet.cit.tum.de' }}
       IMAGE_TAG: k8s-latest
-      POSTGRES_PERSISTENCE_SIZE: 1Gi
-      WEAVIATE_PERSISTENCE_SIZE: 1Gi
+      POSTGRES_PERSISTENCE_SIZE: 8Gi
+      WEAVIATE_PERSISTENCE_SIZE: 10Gi
       POSTGRES_RELEASE_NAME: studymate-postgres
       POSTGRES_CHART_PATH: bitnami/postgresql
       APP_RELEASE_NAME: studymate