Create the chain directory

[pm47]

Otherwise the creation of the jdbc url check file for postgres fails.

[codecov-commenter]

Codecov Report

Merging #1872 (6ba4dd2) into master (95fffe3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1872   +/-   ##
=======================================
  Coverage   87.09%   87.09%           
=======================================
  Files         156      156           
  Lines       11723    11724    +1     
  Branches      455      476   +21     
=======================================
+ Hits        10210    10211    +1     
  Misses       1513     1513           

Impacted Files	Coverage Δ
...ir-core/src/main/scala/fr/acinq/eclair/Setup.scala	80.45% <100.00%> (+0.11%)	⬆️
...main/scala/fr/acinq/eclair/router/Validation.scala	92.30% <0.00%> (-1.16%)	⬇️
...c/main/scala/fr/acinq/eclair/channel/Channel.scala	86.27% <0.00%> (+0.08%)	⬆️
...cala/fr/acinq/eclair/payment/relay/NodeRelay.scala	97.63% <0.00%> (+1.57%)	⬆️