Feature: Allow custom S3 endpoint

[xvilo]

Allow a custom S3 endpoint, used when not using AWS but a different S3 provider that is AWS compatible.

[codecov]

Codecov Report

Merging #534 (d484261) into master (174c381) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #534   +/-   ##
=========================================
  Coverage     99.32%   99.33%           
- Complexity     1884     1885    +1     
=========================================
  Files           300      300           
  Lines          5970     5973    +3     
=========================================
+ Hits           5930     5933    +3     
  Misses           40       40           

Impacted Files	Coverage Δ
src/Service/Integration/Aws/S3AdapterFactory.php	100.00% <100.00%> (ø)

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[xvilo]

Using the following environment variables, I was able to save files correctly to S3

STORAGE_SOURCE=storage.s3
STORAGE_AWS_BUCKET=repman
STORAGE_AWS_REGION=eu-central-1
STORAGE_AWS_OPAQUE_AUTH=true
STORAGE_AWS_KEY='*************'
STORAGE_AWS_SECRET='*************'
STORAGE_AWS_ENDPOINT="https://s3.example.com:443"

PROXY_DIST_DIR='/%kernel.environment%/proxy'
PACKAGES_DIST_DIR='/%kernel.environment%/repo'
SECURITY_ADVISORIES_DB_DIR='/%kernel.environment%/security-advisories'

S3 browser through Mountain duck on MacOS:

[xvilo]

@akondas The following PR has been locally tested and verified as correctly working for our internal S3 set-up. Should work with most if not all Minio instances out there. Could you please review and possibly approve + merge this new feature?

If you're not the right person for this, could you mention the correct person(s) for this?

[akondas]

Thanks, looks good.