fix(docker): fix docker action by adding build target

[gfanton]

In the previous PR #1912, the target was not specified, causing slim images to build the first layer of the Dockerfile. This PR updates the docker action to correctly pass the target argument.

Signed-off-by: gfanton 8671905+gfanton@users.noreply.github.com

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.79%. Comparing base (f962c71) to head (7f7f516).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1920   +/-   ##
=======================================
  Coverage   47.79%   47.79%           
=======================================
  Files         393      393           
  Lines       61643    61643           
=======================================
  Hits        29463    29463           
  Misses      29708    29708           
  Partials     2472     2472           

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