feat(nginx): Use builtin envsubst mechanics of nginx container

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2541>

changes/changelog.d/1939.bugfix

@@ -0,0 +1 @@
+Merge nginx configs for docker production and development setups (#1939)

dev.yml

@@ -115,7 +115,6 @@ services:
       - "node3.funkwhale.test:172.17.0.1"
 
   nginx:
-    command: /entrypoint.sh
     env_file:
       - .env.dev
       - .env
@@ -134,8 +133,7 @@ services:
       - api
       - front
     volumes:
-      - ./docker/nginx/conf.dev:/etc/nginx/nginx.conf.template:ro
-      - ./docker/nginx/entrypoint.sh:/entrypoint.sh:ro
+      - ./docker/nginx/conf.dev:/etc/nginx/templates/default.conf.template:ro
       - "${MUSIC_DIRECTORY_SERVE_PATH-./data/music}:/music:ro"
       - ./deploy/funkwhale_proxy.conf:/etc/nginx/funkwhale_proxy.conf:ro
       - "./front:/frontend:ro"

docker/nginx/conf.dev

@@ -1,43 +1,17 @@
-user  nginx;
-worker_processes  1;
-
-error_log  /var/log/nginx/error.log warn;
-pid        /var/run/nginx.pid;
-
-
-events {
-    worker_connections  1024;
+upstream funkwhale-api {
+    server ${FUNKWHALE_API_IP}:${FUNKWHALE_API_PORT};
+}
+upstream funkwhale-front {
+    server ${FUNKWHALE_FRONT_IP}:${FUNKWHALE_FRONT_PORT};
 }
 
-
-http {
-    include       /etc/nginx/mime.types;
-    default_type  application/octet-stream;
-
-    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
-                      '$status $body_bytes_sent "$http_referer" '
-                      '"$http_user_agent" "$http_x_forwarded_for"';
-
-    access_log  /var/log/nginx/access.log  main;
-
-    sendfile        on;
-
-    keepalive_timeout  65;
-
-    upstream funkwhale-api {
-        server ${FUNKWHALE_API_IP}:${FUNKWHALE_API_PORT};
-    }
-    upstream funkwhale-front {
-        server ${FUNKWHALE_FRONT_IP}:${FUNKWHALE_FRONT_PORT};
-    }
-
-    # Required for websocket support.
-    map $http_upgrade $connection_upgrade {
+# Required for websocket support.
+map $http_upgrade $connection_upgrade {
     default upgrade;
     ''      close;
-    }
+}
 
-    server {
+server {
     listen      80;
     listen [::]:80;
     charset     utf-8;
@@ -163,5 +137,4 @@ http {
         alias /staticfiles/;
     }
 
-    }
 }

docker/nginx/entrypoint.sh

@@ -1,11 +0,0 @@
-#!/bin/sh
-
-set -eux
-
-TEMPLATE_PATH="/etc/nginx/nginx.conf.template"
-CONFIG_PATH="/etc/nginx/nginx.conf"
-
-ALLOWED_VARS="$(env | cut -d '=' -f 1 | xargs printf "\${%s} ")"
-envsubst "$ALLOWED_VARS" < "$TEMPLATE_PATH" | tee "$CONFIG_PATH"
-
-nginx-debug -g 'daemon off;'