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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can use FTP over TLS with user authentication. A quick Google turned up this container which seems really robust and ticks all the boxes - https://hub.docker.com/r/stilliard/pure-ftpd/. Anyway, FTP was just a suggestion. My point was that there are more appropriate options for file sharing than giving a user shell access where he could do far more than just access files. To get that properly locked down and monitored for malicious activity is a lot of work to just share files.
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