switching to borderline vanilla nginx docker image

docker/beta/Dockerfile

@@ -1,10 +1,5 @@
-FROM ghcr.io/nginxinc/nginx-s3-gateway/nginx-oss-s3-gateway:latest 
+FROM nginx:latest
+
+COPY nginx.conf /etc/nginx/nginx.conf
 
-# Prepopulate some of the more generic settings for the proxy
-ENV AWS_SIGS_VERSION=2 		\
-	S3_STYLE=virtual 		\
-	PROVIDE_INDEX_PAGE=true \
-	S3_SERVER_PORT=443 		\
-	S3_SERVER_PROTO=https 	\
-	ALLOW_DIRECTORY_LIST=false