Add slightly better workaround for current workflow issues (#5507)

* checks: Add retry logic to dotnet format style step as well

I can't imagine dotnet format whitespace ever segfaulting,
so hopefully it won't be needed there.

* checks: Replace bash scripts with unstable-commands action

* build: Add unstable-commands action for test step

.github/workflows/checks.yml

@@ -40,23 +40,23 @@ jobs:
         run: |
           dotnet format whitespace --verify-no-changes --report ./whitespace-report.json -v d
 
+      # For some unknown reason this step sometimes fails with exit code 139 (segfault?),
+      # so in that case we'll try again (3 tries max).
       - name: Run dotnet format style
-        run: |
-          dotnet format style --severity info --verify-no-changes --report ./style-report.json -v d
+        uses: TSRBerry/unstable-commands@v1
+        with:
+          commands: dotnet format style --severity info --verify-no-changes --report ./style-report.json -v d
+          timeout-minutes: 5
+          retry-codes: 139
 
-      # For some reason this step sometimes fails with exit code 139 (segfault?),
-      # so should that be the case we'll try again (3 tries max).
+      # For some unknown reason this step sometimes fails with exit code 139 (segfault?),
+      # so in that case we'll try again (3 tries max).
       - name: Run dotnet format analyzers
-        run: |
-          attempt=0
-          exit_code=139
-          until [ $attempt -ge 3 ] || [ $exit_code -ne 139 ]; do
-            ((attempt+=1))
-            exit_code=0
-            echo "Attempt: ${attempt}/3"
-            dotnet format analyzers --severity info --verify-no-changes --report ./analyzers-report.json -v d || exit_code=$?
-          done
-          exit $exit_code
+        uses: TSRBerry/unstable-commands@v1
+        with:
+          commands: dotnet format analyzers --severity info --verify-no-changes --report ./analyzers-report.json -v d
+          timeout-minutes: 5
+          retry-codes: 139
 
       - name: Upload report
         if: failure()