[CI] Drone pipeline improvement

[efaure]

Proposed changes

• Add image pull secret
• Force run on k8s runner

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 44.34%. Comparing base (35d2624) to head (7d9a12a).

Files with missing lines	Patch %	Lines
...rowdstrike/service/CrowdStrikeExecutorService.java	0.00%	1 Missing and 1 partial ⚠️
...rc/main/java/io/openbas/helper/RabbitMQHelper.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/current    #3456      +/-   ##
=====================================================
- Coverage              44.40%   44.34%   -0.06%     
+ Complexity              2799     2797       -2     
=====================================================
  Files                    762      762              
  Lines                  23138    23139       +1     
  Branches                1610     1611       +1     
=====================================================
- Hits                   10274    10262      -12     
- Misses                 12289    12301      +12     
- Partials                 575      576       +1     

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