Rerun the test if LeakSanitizer crashed while running it

This crash (see https://github.com/google/sanitizers/issues/1353)
happens sporadically but regularly enough to be annoying, so try to work
around it by rerunning the test and hope that it doesn't happen twice in
a row.

.github/workflows/ci.yml

@@ -182,8 +182,19 @@ jobs:
         if: matrix.skip_testing != true
         working-directory: tests
         run: |
-          ./test || rc=$?
-          if [ -n "$rc" ]; then
+          # Explicitly use bash because /bin/sh doesn't have pipefail option
+          /bin/bash -o pipefail -c './test 2>&1 | tee test.out'
+          rc=$?
+          if [ ${{ matrix.use_asan }} ]; then
+            # Work around spurious crashes by running the test again.
+            # See https://github.com/google/sanitizers/issues/1353
+            if fgrep -q 'LeakSanitizer has encountered a fatal error' test.out; then
+                echo '+++ Rerunning the tests once again after LeakSanitizer crash +++'
+                ./test
+                rc=$?
+            fi
+          fi
+          if [ "$rc" != 0 ]; then
             echo '*** Tests failed, contents of httpbin.log follows: ***'
             echo '-----------------------------------------------------------'
             cat httpbin.log