Add dotenv package

Cargo.toml

@@ -23,6 +23,7 @@ leptos_icons = { version = "0.1.0", default_features = false, features = [
   "BsSkipStartFill",
   "BsSkipEndFill"
 ] }
+dotenv = { version = "0.15.0", optional = true }
 
 [features]
 csr = ["leptos/csr", "leptos_meta/csr", "leptos_router/csr"]
@@ -34,6 +35,7 @@ ssr = [
   "leptos/ssr",
   "leptos_meta/ssr",
   "leptos_router/ssr",
+  "dotenv",
 ]
 
 # Defines a size-optimized profile for the WASM bundle in release mode