Added ability to include directories as an extension of the config file

Cargo.toml

@@ -41,12 +41,14 @@ tempfile = "~3.2"
 cfg-if = "~1.0"
 tokio = { version = "~1.18", features = ["process", "rt-multi-thread"] }
 futures = "~0.3"
-regex = "~1.5"
+regex = "~1.7"
 semver = "~1.0"
 shell-words = "~1.1"
 color-eyre = "~0.6"
 tracing = { version = "~0.1", features = ["attributes", "log"] }
 tracing-subscriber = { version = "~0.3", features = ["env-filter", "time"] }
+merge = "0.1.0"
+regex-split = "0.1.0"
 
 [target.'cfg(target_os = "macos")'.dependencies]
 notify-rust = "~4.5"

config.example.toml

@@ -1,3 +1,10 @@
+# Include any additional configuration file(s)
+# [include] sections are processed in the order you write them
+# Files in $CONFIG_DIR/topgrade/topgrade.d/ are automatically included at the beginning of this file
+[include]
+#paths = ["/etc/topgrade.toml"]
+
+[misc]
 # Don't ask for confirmations
 #assume_yes = true