Add possibility to mount extra secret files

[lvarin]

To allow mount of extra secret files in the jobs it adds:

• TESK_API_TASKMASTER_SECRET_VOLUME_NAME
• TESK_API_TASKMASTER_SECRET_MOUNT_POINT

We need this to sign/encrypt files with crypt4gh and upload the result using sftp.

[codecov[bot]]

Codecov Report

Merging #3 into master will increase coverage by 0.07%. The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
+ Coverage   83.35%   83.42%   +0.07%     
==========================================
  Files          35       35              
  Lines         913      929      +16     
  Branches       96       98       +2     
==========================================
+ Hits          761      775      +14     
  Misses        108      108              
- Partials       44       46       +2     

Impacted Files	Coverage Δ
...ebi/tsc/tesk/config/KubernetesObjectsSupplier.java	92.85% <80.00%> (-2.80%)	:arrow_down:
...c/ebi/tsc/tesk/config/TaskmasterEnvProperties.java	100.00% <100.00%> (ø)

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[lvarin]

I guess this PR can be closed without merging. The workflow could get the secret key files as data files?

[aniewielska]

Actually, I wanted to use this PR as a base for global secrets for executors. That would require additional change in tesk-core, if we want to mount the secrets as volumes. But - I realised this PR brings new secrets to taskmaster and not to executors directly. I think I will just implement the change to bring secrets to executors and we will see, if this is what was needed and if this PR makes sense.

[aniewielska]

In the end the global secrets have been implemented here: https://github.com/EMBL-EBI-TSI/tesk-api/pull/5 I will close this PR without merging.