refactor(docker): use templating to handle env variables (#8878)

Refs #8877

docker/default.conf.template

@@ -1,20 +1,7 @@
-worker_processes      1;
-
-events {
-  worker_connections  1024;
-}
-
-http {
-  include             mime.types;
-  default_type        application/octet-stream;
   types {
     text/plain yaml;
     text/plain yml;
-}
-
-  sendfile on;
-
-  keepalive_timeout   65;
+  }
 
   gzip on;
   gzip_static on;
@@ -29,28 +16,27 @@ http {
   server_tokens off; # Hide Nginx version
 
   server {
-    listen            8080;
+    listen            $PORT;
     server_name       localhost;
     index             index.html index.htm;
 
-    location / {
+    location $BASE_URL {
       absolute_redirect off;
       alias            /usr/share/nginx/html/;
       expires 1d;
 
       location ~ swagger-initializer.js {
         expires -1;
-        include cors.conf;
+        include templates/cors.conf;
       }
 
       location ~* \.(?:json|yml|yaml)$ {
         #SWAGGER_ROOT
         expires -1;
 
-        include cors.conf;
+        include templates/cors.conf;
       }
 
-      include cors.conf;
+      include templates/cors.conf;
     }
   }
-}

docker/docker-entrypoint.d/40-swagger-ui.sh

@@ -1,18 +1,13 @@
 #! /bin/sh
 
 set -e
-BASE_URL=${BASE_URL:-/}
 NGINX_ROOT=/usr/share/nginx/html
 INITIALIZER_SCRIPT=$NGINX_ROOT/swagger-initializer.js
-NGINX_CONF=/etc/nginx/nginx.conf
+NGINX_CONF=/etc/nginx/conf.d/default.conf
 
 node /usr/share/nginx/configurator $INITIALIZER_SCRIPT
 
 
-if [[ "${BASE_URL}" != "/" ]]; then
-  sed -i "s|location / {|location $BASE_URL {|g" $NGINX_CONF
-fi
-
 if [ "$SWAGGER_JSON_URL" ]; then
   sed -i "s|https://petstore.swagger.io/v2/swagger.json|$SWAGGER_JSON_URL|g" $INITIALIZER_SCRIPT
   sed -i "s|http://example.com/api|$SWAGGER_JSON_URL|g" $INITIALIZER_SCRIPT
@@ -41,12 +36,7 @@ fi
 
 # enable/disable the address and port for IPv6 addresses that nginx listens on
 if [[ -n "${PORT_IPV6}" ]]; then
-    sed -i "s|8080;|8080;\n    listen            [::]:${PORT_IPV6};|g" $NGINX_CONF
-fi
-
-# replace the PORT that nginx listens on if PORT is supplied
-if [[ -n "${PORT}" ]]; then
-    sed -i "s|8080|${PORT}|g" $NGINX_CONF
+    sed -i "s|${PORT};|${PORT};\n    listen            [::]:${PORT_IPV6};|g" $NGINX_CONF
 fi
 
 find $NGINX_ROOT -type f -regex ".*\.\(html\|js\|css\)" -exec sh -c "gzip < {} > {}.gz" \;