chore(deps): restore dotenvy and replace custom .env loader

Replace the hand-rolled unsafe .env parser with dotenvy's
#[dotenvy::load(required = false)] attribute macro.

Cargo.lock

@@ -623,6 +623,24 @@ version = "0.15.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
 
+[[package]]
+name = "dotenvy"
+version = "0.15.7"
+source = "git+https://github.com/allan2/dotenvy#fa25166994d6978bd2e002f0ed190c0c39674ebe"
+dependencies = [
+ "dotenvy-macros",
+]
+
+[[package]]
+name = "dotenvy-macros"
+version = "0.15.7"
+source = "git+https://github.com/allan2/dotenvy#fa25166994d6978bd2e002f0ed190c0c39674ebe"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.103",
+]
+
 [[package]]
 name = "dunce"
 version = "1.0.5"
@@ -1726,6 +1744,7 @@ dependencies = [
  "clap",
  "derive_more",
  "displaydoc",
+ "dotenvy 0.15.7 (git+https://github.com/allan2/dotenvy)",
  "error-stack",
  "futures",
  "http-body-util",
@@ -2582,7 +2601,7 @@ version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19a9c1841124ac5a61741f96e1d9e2ec77424bf323962dd894bdb93f37d5219b"
 dependencies = [
- "dotenvy",
+ "dotenvy 0.15.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "either",
  "heck",
  "hex",
@@ -2614,7 +2633,7 @@ dependencies = [
  "bytes",
  "crc",
  "digest",
- "dotenvy",
+ "dotenvy 0.15.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "either",
  "futures-channel",
  "futures-core",
@@ -2655,7 +2674,7 @@ dependencies = [
  "bitflags",
  "byteorder",
  "crc",
- "dotenvy",
+ "dotenvy 0.15.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "etcetera",
  "futures-channel",
  "futures-core",

Cargo.toml

@@ -41,6 +41,7 @@ tokio = { version = "1.45.1", features = ["rt", "macros", "rt-multi-thread"] }
 tracing = "0.1.41"
 tracing-error = "0.2.1"
 tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }
+dotenvy = { git = "https://github.com/allan2/dotenvy", features = ["macros"] }
 
 url = "2.5.4"
 serde_json = "1.0.140"

src/main.rs

@@ -45,41 +45,10 @@ enum Error {
     Initialization,
 }
 
+#[dotenvy::load(required = false)]
 #[tokio::main]
 #[tracing::instrument]
 async fn main() -> error_stack::Result<ExitCode, Error> {
-    if std::env::var("USE_DOTENV").is_ok() {
-        // Custom, minimal .env loader to avoid depending on crate helpers in the build image.
-        // This reads .env, parses simple KEY=VALUE lines, strips optional surrounding quotes,
-        // and sets the variables into the environment for the process.
-        if let Ok(content) = std::fs::read_to_string(".env") {
-            for raw_line in content.lines() {
-                let line = raw_line.trim();
-                if line.is_empty() || line.starts_with('#') {
-                    continue;
-                }
-                // Split on the first '='
-                if let Some(eq) = line.find('=') {
-                    let key = line[..eq].trim();
-                    let mut val = line[eq + 1..].trim().to_string();
-                    // Strip surrounding quotes if present
-                    if (val.starts_with('"') && val.ends_with('"'))
-                        || (val.starts_with('\'') && val.ends_with('\''))
-                    {
-                        if val.len() >= 2 {
-                            val = val[1..val.len() - 1].to_string();
-                        }
-                    }
-                    // Only set if key non-empty
-                    if !key.is_empty() {
-                        unsafe { std::env::set_var(key, val) };
-                    }
-                }
-            }
-        } else {
-            tracing::debug!(".env requested via USE_DOTENV but .env file not found");
-        }
-    }
     let console_subscriber = tracing_subscriber::fmt::layer().pretty();
     let error_subscriber = tracing_error::ErrorLayer::default();
     let env_subscriber = EnvFilter::builder()