Recursively create parent directories when creating config dir

[ndr-ds]

Motivation

When this path is executed from inside a docker container, which we usually run as root, $HOME will point to /root, but dirs::config_dir() will actually return $HOME/.config, but the .config directory won't be created yet.
Then when we call fs_err::create_dir("/root/.config/linera"), it can fail because .config won't exist yet.

Proposal

Recursively create directories so that .config is also created, and the command succeeds from within Docker containers as well.

Test Plan

Deploys were failing with this, now they succeed.

Release Plan

• Nothing to do / These changes follow the usual release cycle.

[ndr-ds]

• Make ScyllaDB replication factor configurable #3788 : 2 dependent PRs (#3638 , #3880 )
• Add Local SSD support #3879
• Add dual store support #3878
• Recursively create parent directories when creating config dir #3897 👈 (View in Graphite)
• Adjust state hash computation bucket #3877
• Actually use backend config #3876
• Make release the default mode for Dockerfile #3871 : 1 other dependent PR (#3113 )
• main

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[afck]

(Does this one line really need to be a separate PR in a stack? It gets rebased and CI triggered every time something below it in the stack changes… also, lots of GitHub notification noise.)

[ndr-ds]

Merge activity

• May 9, 5:25 PM EDT: A user started a stack merge that includes this pull request via Graphite.
• May 9, 5:29 PM EDT: Graphite rebased this pull request as part of a merge.
• May 9, 5:29 PM EDT: @ndr-ds merged this pull request with Graphite.