First attempt at replacing serve-4bytes with a nginx docker container drop-in

Dockerfile-4bytes

@@ -0,0 +1,3 @@
+FROM nginx:1.21.1-alpine
+COPY 4bytes/signatures /usr/share/nginx/html/
+COPY nginx-4bytes.conf /etc/nginx/conf.d/default.conf

nginx-4bytes.conf

@@ -0,0 +1,50 @@
+server {
+    listen       80;
+    server_name  localhost;
+
+    #access_log  /var/log/nginx/host.access.log  main;
+
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+
+        # Base on: https://michielkalkman.com/snippets/nginx-cors-open-configuration/
+        if ($request_method = 'OPTIONS') {
+            add_header 'Access-Control-Allow-Origin' '*';
+            #
+            # Om nom nom cookies
+            #
+            add_header 'Access-Control-Allow-Credentials' 'true';
+            add_header 'Access-Control-Allow-Methods' 'GET, OPTIONS';
+
+            #
+            # Custom headers and headers various browsers *should* be OK with but aren't
+            #
+            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
+
+            #
+            # Tell client that this pre-flight info is valid for 20 days
+            #
+            add_header 'Access-Control-Max-Age' 1728000;
+            add_header 'Content-Type' 'text/plain charset=UTF-8';
+            add_header 'Content-Length' 0;
+            return 204;
+        }
+        if ($request_method = 'GET') {
+            add_header 'Access-Control-Allow-Origin' '*';
+            add_header 'Access-Control-Allow-Credentials' 'true';
+            add_header 'Access-Control-Allow-Methods' 'GET, OPTIONS';
+            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
+        }
+    }
+
+    #error_page  404              /404.html;
+
+    # redirect server error pages to the static page /50x.html
+    #
+    error_page   500 502 503 504  /50x.html;
+    location = /50x.html {
+        root   /usr/share/nginx/html;
+    }
+
+}

package.json

@@ -42,9 +42,11 @@
     "build": "craco build",
     "test": "craco test",
     "eject": "react-scripts eject",
-    "serve-4bytes": "serve -p 3001 -C -c serve-4bytes.json",
+    "start-4bytes": "docker run --rm -p 3001:80 --name otterscan-4bytes -d otterscan/4bytes",
+    "stop-4bytes": "docker stop otterscan-4bytes",
     "serve-trustwallet-assets": "serve -p 3002 -C -c serve-trustwallet-assets.json",
-    "serve": "serve -s build"
+    "serve": "serve -s build",
+    "build-docker-4bytes": "docker build -t otterscan/4bytes -f Dockerfile-4bytes ."
   },
   "eslintConfig": {
     "extends": [