fix(ci): fix postgres TCP setup and truncateAll superuser error

- Use apt-get install + configure listen_addresses + md5 auth in pg_hba
  so psql can connect via 127.0.0.1 (not just Unix socket)
- Use pg_ctlcluster restart after config changes + wait for pg_isready
- Replace session_replication_role (requires superuser) with a single
  TRUNCATE ... CASCADE which handles FK deps without elevated privileges
- All 3 integration tests now pass in CI (act + Gitea Actions)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/integration/users_test.ts

@@ -0,0 +1,58 @@
+import { assertEquals, assertExists } from "@std/assert";
+import {
+  closeTestPool,
+  seedRoles,
+  seedUsers,
+  testDb,
+  truncateAll,
+} from "../helpers/db_integration.ts";
+import { users } from "$root/databases/schema.ts";
+
+Deno.test({
+  name: "integration: GET /users - DB round trip",
+  async fn() {
+    await truncateAll();
+
+    const [role] = await seedRoles([{ nom: "employee" }]);
+    await seedUsers([
+      { id: "dupont.jean", nom: "Dupont", prenom: "Jean", idRole: role.id },
+      { id: "martin.alice", nom: "Martin", prenom: "Alice", idRole: role.id },
+    ]);
+
+    const rows = await testDb.select().from(users);
+    assertEquals(rows.length, 2);
+    assertExists(rows.find((u) => u.id === "dupont.jean"));
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration: INSERT user and retrieve by id",
+  async fn() {
+    await truncateAll();
+
+    const [role] = await seedRoles([{ nom: "admin" }]);
+    const [created] = await testDb.insert(users).values({
+      id: "durand.claire",
+      nom: "Durand",
+      prenom: "Claire",
+      idRole: role.id,
+    }).returning();
+
+    assertExists(created);
+    assertEquals(created.id, "durand.claire");
+    assertEquals(created.nom, "Durand");
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration: cleanup - close pool",
+  async fn() {
+    await closeTestPool();
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});