Add --proxy-domain support

root/etc/services.d/code-server/run

 #!/usr/bin/with-contenv bash
 
+# Added by codeserver-golang
+export PATH=$PATH:/usr/local/go/bin
+
 if [ -n "${PASSWORD}" ]; then
   AUTH="password"
 else
   AUTH="none"
   echo "starting with no password"
 fi
+  code-server:
+
+if [ -z ${PROXY_DOMAIN+x} ]; then
+  PROXY_DOMAIN_ARG=""
+else 
+  PROXY_DOMAIN_ARG="--proxy-domain=${PROXY_DOMAIN}"
+fi
 
 exec \
-	s6-setuidgid abc \
-		/app/code-server/code-server \
-			--bind-addr 0.0.0.0:8443 \
-			--user-data-dir /config/data \
-			--extensions-dir /config/extensions \
-			--disable-telemetry \
-			--disable-updates \
-			--auth "${AUTH}" \
-			/config/workspace
+        s6-setuidgid abc \
+                /app/code-server/code-server \
+                        --bind-addr 0.0.0.0:8443 \
+                        --user-data-dir /config/data \
+                        --extensions-dir /config/extensions \
+                        --disable-telemetry \
+                        --disable-updates \
+                        --auth "${AUTH}" \
+                        "${PROXY_DOMAIN_ARG}" \
+                        /config/workspace