[ignore] Allow update_metadata branch to trigger CI (DCNE-252)

[samiib]

PR's created by the GitHub bot don't appear to trigger the pull_request event for the CI.
Added a separate trigger so any pushes to the update_metadata runs the CI.
Hopefully this also shows up in the PR.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.74%. Comparing base (9e2dfc6) to head (5a5bd1c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1306      +/-   ##
==========================================
- Coverage   83.74%   83.74%   -0.01%     
==========================================
  Files         123      123              
  Lines       56180    56214      +34     
==========================================
+ Hits        47049    47074      +25     
- Misses       7255     7263       +8     
- Partials     1876     1877       +1     

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[lhercot]

LGTM