add custom release profile with debuginfo enabled

This is primarily useful for profiling. Also change the nix package to
decide whether to strip based on whether the "release" profile is used.

Cargo.toml

@@ -166,3 +166,7 @@ jemalloc = ["dep:tikv-jemallocator"]
 rocksdb = ["dep:rocksdb"]
 sqlite = ["dep:rusqlite", "dep:parking_lot", "tokio/signal"]
 systemd = ["dep:sd-notify"]
+
+[profile.release-debug]
+inherits = "release"
+debug = true

nix/pkgs/default/default.nix

@@ -78,7 +78,7 @@ let
       ];
     };
 
-    dontStrip = profile == "dev";
+    dontStrip = profile != "release";
 
     buildInputs = lib.optional (featureEnabled "jemalloc") rust-jemalloc-sys;