Add CI probe for Turso TEMP table I/O failure shapes

testCreateTemporaryTable and testTemporaryTableHasPriorityOverStandardTable
fail under Turso with `I/O error: short read on page N` from the
pager. Reproduce the shape directly (without the driver) so we can
see whether the trigger is the AUTOINCREMENT, the DEFAULT, the
INSERT path, or the same-name temp/permanent collision. Probe
output is informational and `continue-on-error` so the job's pass
count is unaffected.

Author: JanJakes

.github/workflows/phpunit-tests-turso.yml

@@ -951,6 +951,62 @@ jobs:
               }
           }
 
+      - name: Probe Turso TEMP table I/O
+        continue-on-error: true
+        env:
+          LD_PRELOAD: ${{ steps.preload.outputs.value }}
+        run: |
+          php <<'PHP'
+          <?php
+          // Reproduce the testCreateTemporaryTable failure shape directly,
+          // varying schema features one at a time so we can see which
+          // shape Turso fails on.
+          $cases = [
+              'plain temp table create+drop' =>
+                  [
+                      "CREATE TEMPORARY TABLE _t1 (id INTEGER, v TEXT)",
+                      "DROP TABLE _t1",
+                  ],
+              'temp table with PRIMARY KEY AUTOINCREMENT, plain' =>
+                  [
+                      "CREATE TEMPORARY TABLE _t2 (id INTEGER PRIMARY KEY AUTOINCREMENT, v TEXT)",
+                      "DROP TABLE _t2",
+                  ],
+              'temp table with NOT NULL DEFAULT' =>
+                  [
+                      "CREATE TEMPORARY TABLE _t3 (id INTEGER PRIMARY KEY AUTOINCREMENT, v TEXT NOT NULL DEFAULT '')",
+                      "DROP TABLE _t3",
+                  ],
+              'temp table create + insert + select + drop' =>
+                  [
+                      "CREATE TEMPORARY TABLE _t4 (id INTEGER PRIMARY KEY AUTOINCREMENT, v TEXT)",
+                      "INSERT INTO _t4 (v) VALUES ('a')",
+                      "SELECT * FROM _t4",
+                      "DROP TABLE _t4",
+                  ],
+              'temp table same name as a real table' =>
+                  [
+                      "CREATE TABLE _t5 (id INTEGER, v TEXT)",
+                      "CREATE TEMPORARY TABLE _t5 (id INTEGER, v TEXT)",
+                      "DROP TABLE _t5",
+                      "DROP TABLE _t5",
+                  ],
+          ];
+          foreach ($cases as $label => $stmts) {
+              $pdo = new PDO('sqlite::memory:');
+              $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+              $err = null;
+              foreach ($stmts as $i => $s) {
+                  try { $pdo->exec($s); }
+                  catch (Throwable $e) {
+                      $err = "stmt #$i ($s) -> " . $e->getMessage();
+                      break;
+                  }
+              }
+              echo ($err ? "FAIL " : "OK   ") . $label . ($err ? " -> $err" : "") . "\n";
+              unset($pdo);
+          }
+
       - name: Install Composer dependencies (root)
         uses: ramsey/composer-install@v3
         with: