code refactor

Reviewed-on: #26

crates/bootstrap/src/tls.rs

@@ -0,0 +1,23 @@
+use std::sync::Once;
+
+pub fn install_crypto_provider() {
+    static INSTALL: Once = Once::new();
+    INSTALL.call_once(|| {
+        let _ = rustls::crypto::ring::default_provider().install_default();
+    });
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn https_client_builds_after_install() {
+        install_crypto_provider();
+        install_crypto_provider();
+        reqwest::Client::builder()
+            .build()
+            .expect("reqwest client builds");
+        assert!(rustls::crypto::CryptoProvider::get_default().is_some());
+    }
+}