ci: switch from Kubernetes to Podman for local deployment

- Update Dockerfile to use fully qualified composer image name
- Replace kubectl commands with podman kube play/down in Makefile
- Change from Kubernetes Secret to ConfigMap for environment variables
- Set imagePullPolicy to Never and use localhost/ prefix for local images
- Reduce replica count to 1 for local development
- Add stop target to Makefile for easier cleanup

Makefile

@@ -5,7 +5,17 @@ build:
 
 deploy: build
 	@if [ ! -f .env ]; then cp .env.example .env; fi
-	kubectl create secret generic mkm-admin-env --from-env-file=.env --dry-run=client -o yaml | kubectl apply -f -
-	kubectl apply -f k8s/deployment.yaml
+	@echo "Cleaning up existing deployment if any..."
+	-podman kube down k8s/deployment.yaml >/dev/null 2>&1
+	@echo "Generating merged deployment with ConfigMap..."
+	@kubectl create configmap mkm-admin-config --from-env-file=.env --dry-run=client -o yaml > k8s/merged_deployment.yaml
+	@echo "---" >> k8s/merged_deployment.yaml
+	@cat k8s/deployment.yaml >> k8s/merged_deployment.yaml
+	@echo "Deploying via podman kube play..."
+	podman kube play k8s/merged_deployment.yaml
+	@rm k8s/merged_deployment.yaml
 
-.PHONY: build deploy
+stop:
+	-podman kube down k8s/deployment.yaml >/dev/null 2>&1
+
+.PHONY: build deploy stop