chore(docker): add .dockerignore and update Dockerfile

Add .dockerignore to exclude node_modules, .git, coverage, .env.
Update Dockerfile to install nodejs/npm, copy package.json, run npm install, and build.
Update compose.prod.yml to set working_dir, restart no, and use array command.
Move drizzle-kit from devDependencies to dependencies.

compose.prod.yml

@@ -16,7 +16,9 @@ services:
 
   migrate:
     image: registry.docker.polytech.djalim.fr/polympr:latest
-    command: node_modules/.bin/drizzle-kit migrate
+    working_dir: /app
+    restart: "no"
+    command: ["node", "node_modules/.bin/drizzle-kit", "migrate"]
     env_file: .env
     depends_on:
       db: