Fix(postgresql): Initialise database without locale en_US.UTF8 avalaible systemwide

Currently postgres rely on en_US.UTF8 locale to be available for the
current machine. But it is possible to to initialise the database
without this locale to be available.

BUG: #417721
2 jobs for !30 with hefee/bugfix_417721 in 89 minutes and 28 seconds (queued for 101 minutes and 7 seconds)
detached
Status Job ID Name Coverage
  Build
failed #66422
build_clazy_clang_tidy

01:00:25

passed #66421
linux kf5-qt5 qt5.12

00:29:02

1.0%
 
Name Stage Failure
failed
build_clazy_clang_tidy Build The script exceeded the maximum execution time set for the job
clang-tidy -p=/builds/pim/akonadi/build -quiet /builds/pim/akonadi/src/core/models/entityorderproxymodel.cpp
clang-tidy -p=/builds/pim/akonadi/build -quiet /builds/pim/akonadi/src/core/models/selectionproxymodel.cpp
clang-tidy -p=/builds/pim/akonadi/build -quiet /builds/pim/akonadi/src/core/models/entitytreemodel.cpp
clang-tidy -p=/builds/pim/akonadi/build -quiet /builds/pim/akonadi/src/core/models/subscriptionmodel.cpp
clang-tidy -p=/builds/pim/akonadi/build -quiet /builds/pim/akonadi/src/core/models/statisticsproxymodel.cpp
clang-tidy -p=/builds/pim/akonadi/build -quiet /builds/pim/akonadi/src/core/models/tagmodel.cpp
Uploading artifacts for failed job
Pulling docker image gitlab/gitlab-runner-helper:x86_64-738bbe5a ...
ERROR: Job failed: execution took longer than 1h0m0s seconds