Fix tzdata not writable errors when running from flake

config/runtime.exs

@@ -169,3 +169,5 @@ end
 config :teslamate, :srtm_cache, System.get_env("SRTM_CACHE", ".srtm_cache")
 
 config :teslamate, TeslaMate.Vault, key: Util.get_env("ENCRYPTION_KEY", test: "secret")
+
+config :tzdata, :data_dir, System.get_env("TZDATA_DIR")

flake.nix

@@ -82,6 +82,16 @@
 
         };
 
+        postgres_port = 7000;
+        mosquitto_port = 7001;
+
+        psql = pkgs.writeShellScriptBin "teslamate_psql" ''
+          exec "${pkgs.postgresql}/bin/psql" --host "$DATABASE_HOST" --user "$DATABASE_USER" --port "$DATABASE_PORT" "$DATABASE_NAME" "$@"
+        '';
+        mosquitto_sub = pkgs.writeShellScriptBin "teslamate_sub" ''
+          exec "${pkgs.mosquitto}/bin/mosquitto_sub" -h "$MQTT_HOST" -p "$MQTT_PORT" -u "$MQTT_USERNAME" -P "$MQTT_PASSWORD" "$@"
+        '';
+
       in with pkgs; {
         packages.default = pkg;
         devShells.default = devenv.lib.mkShell {
@@ -96,6 +106,9 @@
               prefetch-npm-deps
               # for dashboard scripts
               jq
+              psql
+              mosquitto
+              mosquitto_sub
             ] ++ optional stdenv.isLinux inotify-tools
               ++ optional stdenv.isDarwin terminal-notifier
               ++ optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
@@ -112,14 +125,21 @@
               export DATABASE_PASS="your_secure_password_here"
               export DATABASE_NAME="teslamate"
               export DATABASE_HOST="127.0.0.1"
+              export DATABASE_PORT="${toString postgres_port}"
               export MQTT_HOST="127.0.0.1"
+              export MQTT_PORT="${toString mosquitto_port}"
               export RELEASE_COOKIE="1234567890123456789"
+              export TZDATA_DIR="$PWD/tzdata"
             '';
-            processes.mqtt = { exec = "${pkgs.mosquitto}/bin/mosquitto"; };
+            processes.mqtt = {
+              exec =
+                "${pkgs.mosquitto}/bin/mosquitto -p ${toString mosquitto_port}";
+            };
             services.postgres = {
               enable = true;
               package = pkgs.postgresql_15;
               listen_addresses = "127.0.0.1";
+              port = postgres_port;
               initialDatabases = [{ name = "teslamate"; }];
               initialScript = ''
                 CREATE USER teslamate with encrypted password 'your_secure_password_here';