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This is caused by bubblewrap requiring specific permissions when running in Docker containers. Disabling sandbox does make you install OCaml, but there is a risk of installation scripts of packages wiping home directory https://github.com/ocaml/opam/issues/3231
According to this github comment you need to disable sandboxing by "using the --disable-sandboxing option for opam init in a fresh opam initialisation or via an opamrc. For an initialised opam, you can't use this option, but change the configuration directly in the config file by removing / empty wrap-*-command fields."