Probably my issue is quite trivial but I couldn't find anything about it. What I need is to have a directory always created in my vagrant with specific owner and mode. Is this possible somehow easily?
If you want the folder synced with your host system then add this line to your Vagrantfile within the Vagrant.configure(2) do |config| section:
config.vm.synced_folder "host_dir", "guest_dir", create: true , group: "name_of_group", owner: "name_of_owner"
If you just want to create a folder on the guest system you can use the inline shell provision:
config.vm.provision "shell", inline: "mkdir -p guest_dir && chown -R owner:group guest_dir"
^Assuming you're running a linux vm.