[dockerfile] add fontconfig, to see if this is what causes errors on CI
E.g.: https://gitlab.iscpif.fr/gargantext/haskell-gargantext/-/jobs/18643 paginating QuantumComputing corpus works (MapTerms): Fontconfig error: Cannot load default config file: No such file: (null) Fontconfig error: No writable cache directories
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failed
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test | Test | ||
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