Initial import from 6.3.1 plus compare tool (unsure about server-ce/nginx/overleaf.conf_new into overleaf.conf.template)

tools/compare_docker_images/compare.sh

@@ -0,0 +1,22 @@
+. ./env.sh
+docker history --no-trunc --format '{{.CreatedBy}}' ${OLD_VERSION} > history-old.txt
+docker history --no-trunc --format '{{.CreatedBy}}' ${NEW_VERSION} > history-new.txt
+diff history-old.txt history-new.txt > history-diff.txt
+
+rm -rf old 
+rm -rf new 
+
+id=$(docker create ${OLD_VERSION})
+mkdir -p old
+docker export "$id" | tar -x -C old
+docker rm "$id"
+
+id=$(docker create ${NEW_VERSION})
+mkdir -p new
+docker export "$id" | tar -x -C new
+docker rm "$id"
+
+rm -rf delta
+mkdir -p delta
+rsync -a -c -m --compare-dest="$PWD/old" new/ delta/
+find delta -mindepth 1 -type d -empty -delete

tools/compare_docker_images/env.sh

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+export OLD_VERSION="sharelatex/sharelatex:6.3.0"
+export NEW_VERSION="sharelatex/sharelatex:6.3.1"