feat(k8s): configure dev environment pipeline and namespace

- Rename pipeline to 'deploy-backend-dev' for dev branch
- Add trigger for dev branch only
- Change namespace from 'gohorsejobs' to 'gohorsejobsdev'
- Use DB_NAME_DEV secret for dev database
- Update deployment and service manifests for dev namespace

.drone.yml

@@ -1,10 +1,14 @@
 kind: pipeline
 type: kubernetes
-name: deploy-backend
+name: deploy-backend-dev
 
 # ✅ SERVICE ACCOUNT CORRETO (CLUSTER-WIDE)
 service_account_name: drone-deployer
 
+trigger:
+  branch:
+    - dev
+
 steps:
   - name: build-and-push-backend
     image: plugins/docker:latest
@@ -31,7 +35,7 @@ steps:
       AWS_SECRET_ACCESS_KEY:    { from_secret: AWS_SECRET_ACCESS_KEY }
       CORS_ORIGINS:             { from_secret: CORS_ORIGINS }
       DB_HOST:                  { from_secret: DB_HOST }
-      DB_NAME:                  { from_secret: DB_NAME }
+      DB_NAME:                  { from_secret: DB_NAME_DEV }   # 👈 ÚNICA MUDANÇA
       DB_PASSWORD:              { from_secret: DB_PASSWORD }
       DB_PORT:                  { from_secret: DB_PORT }
       DB_SSLMODE:               { from_secret: DB_SSLMODE }
@@ -65,12 +69,12 @@ steps:
         UPLOAD_DIR=$UPLOAD_DIR
         EOF
 
-      - kubectl -n gohorsejobs delete secret backend-secrets --ignore-not-found
-      - kubectl -n gohorsejobs create secret generic backend-secrets --from-env-file=.env.k8s
+      - kubectl -n gohorsejobsdev delete secret backend-secrets --ignore-not-found
+      - kubectl -n gohorsejobsdev create secret generic backend-secrets --from-env-file=.env.k8s
 
   - name: deploy-backend
     image: bitnami/kubectl:latest
     commands:
-      - kubectl get pods -n gohorsejobs
-      - kubectl apply -n gohorsejobs -f k8s/backend-deployment.yaml
-      - kubectl apply -n gohorsejobs -f k8s/backend-service.yaml
+      - kubectl get pods -n gohorsejobsdev
+      - kubectl apply -n gohorsejobsdev -f k8s/backend-deployment.yaml
+      - kubectl apply -n gohorsejobsdev -f k8s/backend-service.yaml

k8s/backend-deployment.yaml

@@ -2,7 +2,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: gohorse-backend
-  namespace: gohorsejobs
+  namespace: gohorsejobsdev
 spec:
   replicas: 1
   selector:

k8s/backend-service.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 kind: Service
 metadata:
   name: gohorse-backend
-  namespace: gohorsejobs
+  namespace: gohorsejobsdev
 spec:
   selector:
     app: gohorse-backend