build(backend): temporary use local package.json for backend

Earthfile

@@ -301,11 +301,12 @@ front-deps-builder:
 
 backend-pre-build:
     # Build stage: todo: check if we use the same image as frontends
-    FROM +front-deps
+    FROM +node-fr
 
     COPY --chown=node:node $BACKEND_DIR/. $BACKEND_DIR/
-    COPY --chown=node:node $API_DIR/. $API_DIR
-    RUN npm run build:backend && npm prune --omit=dev
+    WORKDIR /app/$BACKEND_DIR
+    RUN npm install
+    RUN npm run build && npm prune --omit=dev
 
     SAVE ARTIFACT . /app
 
@@ -327,7 +328,7 @@ backend-build:
 
     EXPOSE ${PORT}
 
-    CMD ["node", "backend/dist/backend/src/main.js"]
+    CMD ["node", "backend/dist/main.js"]
     SAVE IMAGE --cache-from=$BACKEND_IMG_NAME --push $BACKEND_IMG_NAME
 
 backend-deploy: ## Déploie le backend dans une app Koyeb existante

backend/nest-cli.json

@@ -2,7 +2,7 @@
   "$schema": "https://json.schemastore.org/nest-cli",
   "collection": "@nestjs/schematics",
   "sourceRoot": "src",
-  "entryFile": "backend/src/main",
+  "entryFile": "main",
   "compilerOptions": {
     "deleteOutDir": true
   }