add REDIRECT_SCHEME to support running this image behind a SSL-termination proxy

Dockerfile

@@ -33,6 +33,10 @@ ENV REDIRECT_MODE="none"
 # Which HTTP code should we use for the above redirect
 ENV REDIRECT_CODE=302
 
+# And the protocol we should redirect to. Change this to "https" if you
+# serve via https (e.g. with a SSL-termination proxy infront of this)
+ENV REDIRECT_SCHEME="http"
+
 ADD etc/ /etc/
 ADD usr/ /usr/
 

etc/nginx/sites-available/redirect-apex-to-www.conf

@@ -1,5 +1,5 @@
 server {
     listen 80;
     server_name ~^(?!www.)(?<domain>.+)$;
-    return {{REDIRECT_CODE}} https://www.$domain$request_uri;
+    return {{REDIRECT_CODE}} {{REDIRECT_SCHEME}}://www.$domain$request_uri;
 }

etc/nginx/sites-available/redirect-www-to-apex.conf

@@ -1,5 +1,5 @@
 server {
     listen 80;
     server_name ~^www.(?<domain>.+)$;
-    return {{REDIRECT_CODE}} https://$domain$request_uri;
+    return {{REDIRECT_CODE}} {{REDIRECT_SCHEME}}://$domain$request_uri;
 }

usr/bin/docker-start

@@ -7,6 +7,7 @@ for file in /etc/nginx/*/*.conf; do
     sed -i \
         -e "s#{{REDIRECT_CODE}}#${REDIRECT_CODE}#g" \
         -e "s#{{DOCUMENT_ROOT}}#${DOCUMENT_ROOT}#g" \
+        -e "s#{{REDIRECT_SCHEME}}#${REDIRECT_SCHEME}#g" \
         "${file}"
 done