Issue #9295 - Add back non-blocking bors to trigger CI on contributor PRs

[liuche]

Added bors back to taskcluster scripts, and updating some of the trigger/block parameters.

Pull Request checklist

• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features. In addition, it includes a screenshot of a successful accessibility scan to ensure no new defects are added to the product.

After merge

• Milestone: Make sure issues finished by this pull request are added to the milestone of the version currently in development.

To download an APK when reviewing a PR:

1. click on Show All Checks,
2. click Details next to "Taskcluster (pull_request)" after it appears and then finishes with a green checkmark,
3. click on the "Fenix - assemble" task, then click "Run Artifacts".
4. the APK links should be on the left side of the screen, named for each CPU architecture

[firefoxci-taskcluster]

Submitting the task to Taskcluster failed. Details

bad indentation of a mapping entry at line 25, column 31:
$if: 'tasks_for == "github-pull- ...
^

[firefoxci-taskcluster]

Submitting the task to Taskcluster failed. Details

bad indentation of a mapping entry at line 25, column 31:
$if: 'tasks_for == "github-pull- ...
^

[firefoxci-taskcluster]

Submitting the task to Taskcluster failed. Details

can not read a block mapping entry; a multiline key may not be an implicit key at line 26, column 34:
$if: 'tasks_for == "github-pull-req ...
^

[JohanLorenzo]

bors try

[JohanLorenzo]

bors try

I guess this PR needs to be merged before bors actually takes on requests. I'll try this out with #9826

[codecov-io]

Codecov Report

Merging #9843 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #9843      +/-   ##
============================================
+ Coverage     19.14%   19.16%   +0.01%     
  Complexity      521      521              
============================================
  Files           337      337              
  Lines         13708    13708              
  Branches       1838     1838              
============================================
+ Hits           2625     2627       +2     
+ Misses        10843    10842       -1     
+ Partials        240      239       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ix/home/sessioncontrol/SessionControlController.kt	72.72% <0.00%> (+0.90%)	0.00% <0.00%> (ø%)
...c/main/java/org/mozilla/fenix/components/Search.kt	100.00% <0.00%> (+8.33%)	2.00% <0.00%> (ø%)

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[JohanLorenzo]

Looks all good to me! I think bors won't block any regular merges while still allowing bors try to run. Thanks for taking care of it @liuche 😃