Fig tree or bush

i bought a very small fig plant back in the spring, I was warned to not plant it in the garden unless I sow it in a washing machine drum to prevent it from putting all its energy into roots instead of fruit. So I planted it in a planter that I can moved inside the tunnel in the winter.
I was very surprised last week to find some babies.     
Some people have told me to plant it in one of the raised beds in the tunnel and leave it in there all year round.
Any suggestions from experience???