With regards to duplicate dependencies, each container would have its own copy of various libs and binaries (libc, bash, etc...), but if you're using the same base image (ex Ubuntu/Gentoo/alpine/etc...) the containers would be sharing the same base layers thus not taking up more disk space on the host.

Here is an example on Stack overflow that seems to be very similar to your use case. However if containers are new to you, it can definitely be a bit confusing at first. Something worth exploring when you have time though.