Fixed pid1 ownership inside fpco/stack-build docker image (#3159)
Fixed pid1 ownership inside fpco/stack-build docker image (#3159)

* Fixed pid1 ownership inside fpco/stack-build docker image

MichielDerhaeg/stack,Fuuzetsu/stack,anton-dessiatov/stack,martin-kolinek/stack,juhp/stack,mrkkrp/stack,MichielDerhaeg/stack,juhp/stack,mrkkrp/stack,anton-dessiatov/stack,Fuuzetsu/stack,martin-kolinek/stack