feat(opnsense-config): dnsmasq dhcp static mappings (#130)

Co-authored-by: Jean-Gabriel Gill-Couture <jeangabriel.gc@gmail.com>
Co-authored-by: Ian Letourneau <ian@noma.to>
Reviewed-on: #130
Reviewed-by: Ian Letourneau <ian@noma.to>
Co-authored-by: Jean-Gabriel Gill-Couture <jg@nationtech.io>
Co-committed-by: Jean-Gabriel Gill-Couture <jg@nationtech.io>

harmony/src/domain/config/mod.rs

@@ -0,0 +1,25 @@
+pub mod secret;
+
+use lazy_static::lazy_static;
+use std::path::PathBuf;
+
+lazy_static! {
+    pub static ref HARMONY_DATA_DIR: PathBuf = directories::BaseDirs::new()
+        .unwrap()
+        .data_dir()
+        .join("harmony");
+    pub static ref REGISTRY_URL: String =
+        std::env::var("HARMONY_REGISTRY_URL").unwrap_or_else(|_| "hub.nationtech.io".to_string());
+    pub static ref REGISTRY_PROJECT: String =
+        std::env::var("HARMONY_REGISTRY_PROJECT").unwrap_or_else(|_| "harmony".to_string());
+    pub static ref DRY_RUN: bool =
+        std::env::var("HARMONY_DRY_RUN").is_ok_and(|value| value.parse().unwrap_or(false));
+    pub static ref DEFAULT_DATABASE_URL: String = "sqlite://harmony.sqlite".to_string();
+    pub static ref DATABASE_URL: String = std::env::var("HARMONY_DATABASE_URL")
+        .map(|value| if value.is_empty() {
+            (*DEFAULT_DATABASE_URL).clone()
+        } else {
+            value
+        })
+        .unwrap_or((*DEFAULT_DATABASE_URL).clone());
+}