Use native nginx templating

docker-compose.yml

@@ -20,16 +20,17 @@ services:
     networks:
       - nginx-passthrough
   nginx:
-    build: ./nginx/
+    image: nginx:mainline-alpine
+    restart: always
     env_file:
       - .env
+    volumes:
+      - ./nginx:/etc/nginx/templates
+      - /etc/certbot/conf:/etc/letsencrypt
+      - /etc/certbot/www:/var/www/certbot
     ports:
       - 80:80
       - 443:443
-    volumes:
-      - /etc/certbot/conf:/etc/letsencrypt
-      - /etc/certbot/www:/var/www/certbot
-    restart: always
     networks:
       - nginx-passthrough
   certbot:

nginx/Dockerfile

@@ -1,7 +0,0 @@
-FROM nginx:mainline-alpine
-
-COPY ./nginx.conf /etc/nginx/conf.d/
-
-RUN sed -i 's/{API_PORT}/'"$API_PORT"'/g' /etc/nginx/conf.d/nginx.conf.template && \
-    sed -i 's/{DOMAIN}/'"$DOMAIN"'/g' /etc/nginx/conf.d/nginx.conf.template && \
-    mv /etc/nginx/conf.d/nginx.conf.template /etc/nginx/conf.d/nginx.conf

nginx/nginx.conf.template

@@ -1,23 +1,23 @@
 server {
     listen 80;
 
-    server_name {DOMAIN} www.{DOMAIN};
-
-    return 301 https://{DOMAIN}$request_uri;
-}
-
-server {
-    listen 443 ssl http2;
-    ssl_certificate /etc/letsencrypt/live/{DOMAIN}/fullchain.pem;
-    ssl_certificate_key /etc/letsencrypt/live/{DOMAIN}/privkey.pem;
-    server_name {DOMAIN} www.{DOMAIN};
-
-    location / {
-        proxy_pass http://api:{API_PORT}/;
-    }
+    server_name ${DOMAIN} www.${DOMAIN};
 
     location ~ /.well-known/acme-challenge {
         allow all;
         root /var/www/certbot;
     }
+
+    return 301 https://${DOMAIN}$request_uri;
+}
+
+server {
+    listen 443 ssl http2;
+    ssl_certificate /etc/letsencrypt/live/${DOMAIN}/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/${DOMAIN}/privkey.pem;
+    server_name ${DOMAIN} www.${DOMAIN};
+
+    location / {
+        proxy_pass http://api:${API_PORT}/;
+    }
 }