feat(docker-compose): use env vars from compose

backend.dockerfile

@@ -1,8 +1,5 @@
 FROM node:slim
 
-ARG SEARXNG_API_URL
-ENV SEARXNG_API_URL=${SEARXNG_API_URL}
-
 WORKDIR /home/perplexica
 
 COPY src /home/perplexica/src

docker-compose.yaml

@@ -13,9 +13,9 @@ services:
     build:
       context: .
       dockerfile: backend.dockerfile
-      args:
-        - SEARXNG_API_URL=http://searxng:8080
     image: itzcrazykns1337/perplexica-backend:main
+    environment:
+      - SEARXNG_API_URL=http://searxng:8080
     depends_on:
       - searxng
     ports: