Fix helm namespace - deploy to default namespace (#17)

The self-hosted runner runs in the github-runner namespace, so helm was
using that as the default. This caused helm to think releases didn't
exist (it was looking in github-runner but releases are in default).

Added --namespace default to helm commands and -n default to kubectl.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: cmyui

.github/workflows/production-deploy.yml

@@ -70,11 +70,12 @@ jobs:
 
       - name: Clear pending deployments
         run: |
-          kubectl delete secret -l 'status in (pending-install, pending-upgrade, pending-rollback),name=payments-service-production'
+          kubectl delete secret -n default -l 'status in (pending-install, pending-upgrade, pending-rollback),name=payments-service-production'
 
       - name: Show manifest diff since previous release
         run: |
           helm diff upgrade \
+          --namespace default \
           --allow-unreleased \
           --color=true \
           --values chart/values.yaml \
@@ -84,6 +85,7 @@ jobs:
       - name: Deploy service to production cluster
         run: |
           helm upgrade \
+            --namespace default \
             --install \
             --atomic \
             --wait --timeout 10m \