[cherry-pick][v1.10] Remove container-builder-env section and add pr-containers action

[blackpiglet]

• Add PR container build action, which will not push the Velero image.
• Add GOARM parameter in Restic docker builder section in Dockerfile.
• Remove the container-builder-env section from Makefile.

Signed-off-by: Xun Jiang blackpiglet@gmail.com

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[codecov-commenter]

Codecov Report

Merging #5770 (bc7d1d0) into release-1.10 (62287da) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           release-1.10    #5770   +/-   ##
=============================================
  Coverage         40.85%   40.85%           
=============================================
  Files               239      239           
  Lines             20663    20663           
=============================================
  Hits               8442     8442           
  Misses            11604    11604           
  Partials            617      617           

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