Restrict docker/deploy jobs to upstream repo, cancel concurrent test runs

[charlesbluca]

Matches some tweaks made to the GHA workflows in the RAPIDS fork

[codecov-commenter]

Codecov Report

Merging #254 (96165b3) into main (e63990c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #254   +/-   ##
=======================================
  Coverage   99.61%   99.61%           
=======================================
  Files          64       64           
  Lines        2608     2608           
  Branches      367      367           
=======================================
  Hits         2598     2598           
  Misses          8        8           
  Partials        2        2           

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