docs: moving docker volumes (#409)

docs/reports/2024-09-19-move-docker-volumes.md

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+# 2024-09-19 move docker volumes
+
+Previously in an attempt not to have all docker volumes on the system disk,
+I did mount some on /srv/off/docker_data, on docker-staging and docker-prod VM.
+
+In between we have directly mounted the disk for docker volumes on /var/lib/docker/volumes
+but we forgot to move those other volumes.
+
+As it took space on system disk we got alerts about it !
+
+So I had to move them.
+
+Here is a quick dump of what I did, justs in case…
+
+```bash
+# shutdown and rm container (to be able to rm volumes)
+sudo -u off docker compose down
+
+# copy volumes data in a temporary place
+time rsync -a --info=progress2 /srv/off/docker_data/po_search_esdata01 /var/lib/docker/volumes/po_search_esdata01.tmp
+time rsync -a --info=progress2 /srv/off/docker_data/po_search_esdata02 /var/lib/docker/volumes/po_search_esdata02.tmp
+
+
+# Edited Makefile, see https://github.com/openfoodfacts/search-a-licious/commit/51a2450ee84854686b593213bd74eae7794461a7
+
+# removed volumes
+docker volume rm po_search_esdata01
+docker volume rm po_search_esdata02
+
+# re-create volumes with modified Makefile
+# important to do with user off
+sudo -u off make create_external_volumes
+
+# fix ownership, not sure if needed
+chown off:root /var/lib/docker/volumes/po_search_esdata0{1,2}/_data
+
+# move data to new volumes dirs
+mv /var/lib/docker/volumes/po_search_esdata02.tmp/po_search_esdata02/* /var/lib/docker/volumes/po_search_esdata02/_data/
+mv /var/lib/docker/volumes/po_search_esdata01.tmp/po_search_esdata01/* /var/lib/docker/volumes/po_search_esdata01/_data/
+
+# restart services
+sudo -u off docker compose up -d
+
+# if it went well remove old data and temporary dirs
+rm -rf /srv/off/docker_data/po_search_esdata01/
+rm -rf /srv/off/docker_data/po_search_esdata02
+rmdir /var/lib/docker/volumes/po_search_esdata02.tmp/po_search_esdata02
+rmdir /var/lib/docker/volumes/po_search_esdata02.tmp
+rmdir /var/lib/docker/volumes/po_search_esdata01.tmp/po_search_esdata01
+rmdir /var/lib/docker/volumes/po_search_esdata01.tmp
+
+# verify disk space is still ok
+df -h / /var/lib/docker/volumes
+```