Enable application deployment by building directly from source code

Updates docker-compose and portainer-stack files to build the regisflow image and adds PORTAINER_SOLUTION.md, and portainer-build-stack.yml.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: dec54137-d5a2-4406-8ad4-5f2f9fb110bf
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/6766644a-420b-4242-91df-d40e1146cc68.jpg

portainer-stack.yml

@@ -23,9 +23,12 @@ services:
       retries: 5
       start_period: 30s
 
-  # Application RegisFlow - Image construite localement
+  # Application RegisFlow - Construction depuis le code source
   regisflow:
-    image: regisflow:latest
+    build:
+      context: .
+      dockerfile: Dockerfile
+      target: production
     container_name: regisflow-app
     depends_on:
       regisflow-db: