Use configuration file

config/default.toml

@@ -0,0 +1,7 @@
+[application]
+port = 8000
+# See https://docs.rs/tracing-subscriber/latest/tracing_subscriber/struct.EnvFilter.html
+log_directive = "info"
+
+[taskwarrior]
+data_location = "/tmp"

config/test.toml

@@ -0,0 +1,2 @@
+[application]
+log_directive = "debug"