fix(worker): enable safe multi-instance job processing

Tiku.IntegrationTests/Infrastructure/DockerPostgresTestDefaults.cs

@@ -0,0 +1,28 @@
+using Npgsql;
+
+namespace Tiku.IntegrationTests.Infrastructure;
+
+internal static class DockerPostgresTestDefaults
+{
+    internal static string AdminConnectionString => CreateConnectionString("postgres", false);
+
+    internal static string CreateConnectionString(string database, bool pooling = true)
+    {
+        return new NpgsqlConnectionStringBuilder
+        {
+            Host = "127.0.0.1",
+            Port = ParsePort(Environment.GetEnvironmentVariable("TIKU_POSTGRES_PORT")),
+            Database = database,
+            Username = Environment.GetEnvironmentVariable("TIKU_POSTGRES_USER") ?? "tiku",
+            Password = Environment.GetEnvironmentVariable("TIKU_POSTGRES_PASSWORD") ?? "tiku_dev",
+            Pooling = pooling,
+            Timeout = 5,
+            CommandTimeout = 60
+        }.ConnectionString;
+    }
+
+    private static int ParsePort(string? value)
+    {
+        return int.TryParse(value, out var port) && port is >= 1 and <= 65535 ? port : 5432;
+    }
+}