acceptance: bump runners to 10 (#104791)

Author: JonasBa

.github/workflows/acceptance.yml

@@ -57,11 +57,11 @@ jobs:
       # and reducing the risk that one of many runs would turn red again (read: intermittent tests)
       fail-fast: false
       matrix:
-        # XXX: When updating this, make sure you also update MATRIX_INSTANCE_TOTAL.
-        instance: [0, 1, 2, 3, 4]
+        # XXX: Use 5 runners when backend changes are present, 10 runners for frontend-only changes
+        instance: ${{ needs.files-changed.outputs.backend_all == 'true' && fromJSON('[0, 1, 2, 3, 4]') || fromJSON('[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]') }}
     env:
-      # XXX: MATRIX_INSTANCE_TOTAL must be hardcoded to the length of strategy.matrix.instance.
-      MATRIX_INSTANCE_TOTAL: 5
+      # XXX: MATRIX_INSTANCE_TOTAL must match the matrix size (5 for backend changes, 10 for frontend-only)
+      MATRIX_INSTANCE_TOTAL: ${{ needs.files-changed.outputs.backend_all == 'true' && '5' || '10' }}
       TEST_GROUP_STRATEGY: roundrobin
 
     steps:

codecov.yml

@@ -83,7 +83,7 @@ flags:
     carryforward: true
     # Do not send any status checks until n coverage reports are uploaded.
     # NOTE: If you change this, make sure to change `comment.after_n_builds` below as well.
-    # this should match MATRIX_INSTANCE_TOTAL in accpetance.yml
+    # this should match MATRIX_INSTANCE_TOTAL in accpetance.yml when backend_all == true
     after_n_builds: 5
 
 # https://docs.codecov.com/docs/flags#two-approaches-to-flag-management