refactor: use confik instead of config

databases/postgres/src/config.rs

@@ -0,0 +1,23 @@
+use confik::Configuration;
+use serde::Deserialize;
+
+#[derive(Debug, Default, Configuration)]
+pub struct ExampleConfig {
+    pub server_addr: String,
+    #[confik(from = DbConfig)]
+    pub pg: deadpool_postgres::Config,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(transparent)]
+struct DbConfig(deadpool_postgres::Config);
+
+impl From<DbConfig> for deadpool_postgres::Config {
+    fn from(value: DbConfig) -> Self {
+        value.0
+    }
+}
+
+impl confik::Configuration for DbConfig {
+    type Builder = Option<Self>;
+}