test/system: add regression test for TZDIR local issue

Regression test for containers#23550. Setting the TZDIR env should make no
difference for the local timezone as this is not a real timezone name
that is resolved from that directory.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>
(cherry picked from commit fb3a0e9)
Signed-off-by: Paul Holzinger <pholzing@redhat.com>

test/system/030-run.bats

@@ -534,6 +534,11 @@ json-file | f
     expect="$output"
     TZ=Pacific/Chatham run_podman run --rm --tz=local $IMAGE date -Iseconds -r $testfile
     is "$output" "$expect" "podman run with --tz=local, matches host"
+
+    # Force a TZDIR env as local should not try to use the TZDIR at all, #23550.
+    # This used to fail with: stat /usr/share/zoneinfo/local: no such file or directory.
+    TZDIR=/usr/share/zoneinfo run_podman run --rm --tz=local $IMAGE date -Iseconds -r $testfile
+    is "$output" "$expect" "podman run with --tz=local ignored TZDIR"
 }
 
 # bats test_tags=ci:parallel