cmd/database/create: Avoid creation of the same package multiple times

[geaaru]

This is what happens now if it's already present:

$> luet database create Digest-HMAC-dev-perl-1.30.0-r1.metadata.yaml 
 Package dev-perl/Digest-HMAC-1.30.0-r1  already present.

[mudler]

Tests are failing genuinely

[geaaru]

:'( it's weird, i only avoid the creation of the same package... i will check the tests.

[codecov-commenter]

Codecov Report

Merging #222 (a5d71b6) into develop (654b5b4) will decrease coverage by 2.41%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #222      +/-   ##
===========================================
- Coverage    48.22%   45.80%   -2.42%     
===========================================
  Files           45       45              
  Lines         6078     6078              
===========================================
- Hits          2931     2784     -147     
- Misses        2595     2788     +193     
+ Partials       552      506      -46     

Impacted Files	Coverage Δ
pkg/installer/client/docker.go	0.00% <0.00%> (-57.84%)	:arrow_down:
pkg/installer/repository_docker.go	0.00% <0.00%> (-48.82%)	:arrow_down:
pkg/installer/repository.go	47.42% <0.00%> (-8.28%)	:arrow_down:

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[mudler]

Thanks!