Configure diagnostics (and MapLibre) using Pkl. (#3820)

* Bump the version for the next release.

* Ignore all generated sources.

* Use Pkl+XcodeGen to inject secrets instead of the project.

* Inject the PostHog/Sentry/Rageshake configuration from the environment.

* Fix bad unicode.

* Fix unit tests.

Secrets/Secrets.pkl

@@ -0,0 +1,17 @@
+//
+// Copyright 2025 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+// Please see LICENSE files in the repository root for full details.
+//
+
+// Analytics and Diagnostics
+
+sentryDSN = read("env:SENTRY_DSN")
+postHogHost = read("env:POSTHOG_HOST")
+postHogAPIKey = read("env:POSTHOG_API_KEY")
+rageshakeServerURL = read("env:RAGESHAKE_SERVER_URL")
+
+// Maps
+
+mapLibreAPIKey = read("env:MAPLIBRE_API_KEY")

Secrets/Secrets.swift

@@ -0,0 +1,19 @@
+// swiftlint:disable all
+// Generated using SwiftGen — https://github.com/SwiftGen/SwiftGen
+
+import Foundation
+
+// swiftlint:disable superfluous_disable_command
+// swiftlint:disable file_length
+
+// MARK: - YAML Files
+
+// swiftlint:disable identifier_name line_length number_separator type_body_length
+internal enum Secrets {
+  internal static let mapLibreAPIKey: String = "your_key"
+  internal static let postHogAPIKey: String = "your_key"
+  internal static let postHogHost: String = "https://posthog.localhost"
+  internal static let rageshakeServerURL: String = "https://rageshake.localhost"
+  internal static let sentryDSN: String = "https://sentry.localhost"
+}
+// swiftlint:enable identifier_name line_length number_separator type_body_length