minor symfony#53141 [CI] Show exit code when job fails (Nyholm)

This PR was squashed before being merged into the 5.4 branch.

Discussion
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[CI] Show exit code when job fails

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

This is just a small small PR to show what exit code the job failed with.

Commits
-------

c553cc8 [CI] Show exit code when job fails

Author: xabbuh

.github/workflows/unit-tests.yml

@@ -155,12 +155,13 @@ jobs:
             local ok=0
             local title="$1$FLIP"
             local start=$(date -u +%s)
-            OUTPUT=$(bash -xc "$2" 2>&1) || ok=1
+            OUTPUT=$(bash -xc "$2" 2>&1) || ok=$?
             local end=$(date -u +%s)
 
             if [[ $ok -ne 0 ]]; then
               printf "\n%-70s%10s\n" $title $(($end-$start))s
               echo "$OUTPUT"
+              echo "Job exited with: $ok"
               echo -e "\n::error::KO $title\\n"
             else
               printf "::group::%-68s%10s\n" $title $(($end-$start))s