Cache env variables

[francoisferrand]

Reading env variables is costly, so do it only once on startup.

Issue: ARSN-442

[bert-e]

Hello francoisferrand,

My role is to assist you with the merge of this
pull request. Please type @bert-e help to get information
on this process, or consult the user documentation.

Available options

name	description	privileged	authored
/after_pull_request	Wait for the given pull request id to be merged before continuing with the current one.
/bypass_author_approval	Bypass the pull request author's approval	⭐
/bypass_build_status	Bypass the build and test status	⭐
/bypass_commit_size	Bypass the check on the size of the changeset TBA	⭐
/bypass_incompatible_branch	Bypass the check on the source branch prefix	⭐
/bypass_jira_check	Bypass the Jira issue check	⭐
/bypass_peer_approval	Bypass the pull request peers' approval	⭐
/bypass_leader_approval	Bypass the pull request leaders' approval	⭐
/approve	Instruct Bert-E that the author has approved the pull request.		✍️
/create_pull_requests	Allow the creation of integration pull requests.
/create_integration_branches	Allow the creation of integration branches.
/no_octopus	Prevent Wall-E from doing any octopus merge and use multiple consecutive merge instead
/unanimity	Change review acceptance criteria from one reviewer at least to all reviewers
/wait	Instruct Bert-E not to run until further notice.

Available commands

name	description	privileged
/help	Print Bert-E's manual in the pull request.
/status	Print Bert-E's current status in the pull request TBA
/clear	Remove all comments from Bert-E from the history TBA
/retry	Re-start a fresh build TBA
/build	Re-start a fresh build TBA
/force_reset	Delete integration branches & pull requests, and restart merge process from the beginning.
/reset	Try to remove integration branches unless there are commits on them which do not appear on the source branch.

Status report is not available.

[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• 2 peers

[williamlardier]

👍

[francoisferrand]

/approve

[bert-e]

I have successfully merged the changeset of this pull request
into targetted development branches:

• ✔️ development/8.2

The following branches have NOT changed:

• development/6.4
• development/7.10
• development/7.4
• development/7.70
• development/8.1

Please check the status of the associated issue ARSN-442.

Goodbye francoisferrand.

The following options are set: approve

[codecov]

Codecov Report

Attention: Patch coverage is 79.48718% with 8 lines in your changes missing coverage. Please review.

Project coverage is 66.33%. Comparing base (07efddd) to head (756a42d).
Report is 4 commits behind head on development/8.2.

Files with missing lines	Patch %	Lines
lib/s3middleware/processMpuParts.ts	16.66%	5 Missing ⚠️
...orage/metadata/mongoclient/MongoClientInterface.js	90.00%	2 Missing ⚠️
lib/auth/v2/queryAuthCheck.ts	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           development/8.2    #2280      +/-   ##
===================================================
+ Coverage            66.30%   66.33%   +0.03%     
===================================================
  Files                  215      215              
  Lines                17336    17340       +4     
  Branches              3555     3545      -10     
===================================================
+ Hits                 11494    11502       +8     
+ Misses                5827     5822       -5     
- Partials                15       16       +1     

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