no root user + docker ignore dockerfile

[glutamatt]

Description

security recommendations are to avoid root in containers

Motivation and Context

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[zhouzhuojie]

thanks, let's also change this file https://github.com/openflagr/flagr/blob/main/integration_tests/Dockerfile-Integration-Test

[glutamatt]

thanks, let's also change this file https://github.com/openflagr/flagr/blob/main/integration_tests/Dockerfile-Integration-Test

done

[codecov-commenter]

Codecov Report

Merging #52 (cc3cbfe) into main (1694d8e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   81.55%   81.55%           
=======================================
  Files          27       27           
  Lines        2174     2174           
=======================================
  Hits         1773     1773           
  Misses        314      314           
  Partials       87       87           

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