Washtub/container

I have an old galvanised washtub that I want to use as a planter. Should I put the soil directly in it and plant up or put a pot in it? I was assuming that over time the damp soil would rot it if I plant straight in to it? I would love to see some examples of your old tubs etc. thank you.
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I came across this article which might help.
https://www.gardenersworld.com/how-to/grow-plants/herb-container-display/