deploy ssl proxy to dynamic sandbox openshift, add docker logout

[tnein]

Summary

This PR adds deployment of the ssl-proxy docker image to the dynamic sandbox openshift namespaces (see GitLab: psd2-dynamic-sandbox/issues/81). For improved security it also logs out of the docker registries after using them.

Checklist for Definition of Done

• [x] Code is technically reviewed by myself
• [x] Code is manually tested * [ ] Automatic tests for new functionality are created * [ ] Documentation is updated
• [x] Git history is clean

[codecov[bot]]

Codecov Report

Merging #112 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #112   +/-   ##
=========================================
  Coverage     72.33%   72.33%           
  Complexity      246      246           
=========================================
  Files            67       67           
  Lines          1359     1359           
  Branches         90       90           
=========================================
  Hits            983      983           
  Misses          335      335           
  Partials         41       41

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