feat(docker-stack): add archmirror stack

docker/stacks/archmirror/nginx/nginx.conf

@@ -0,0 +1,30 @@
+events {
+    worker_connections 1024;
+}
+
+http {
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
+    sendfile on;
+    gzip on;
+
+    server {
+        listen 80;
+        root /usr/share/nginx/html;
+        
+        location /archlinux/ {
+            alias /usr/share/nginx/html/archlinux/;
+            autoindex on;
+        }
+
+        location = / {
+            return 301 /archlinux/;
+        }
+
+        location /health {
+            return 200 "OK\n";
+            add_header Content-Type text/plain;
+        }
+    }
+}