nix: add sqlite in devShell

Since sqlite is used for the databases, including the sqlite3 binary
in the devShell is useful for debugging purposes.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

flake.nix

@@ -219,6 +219,7 @@
           pkgs.cargo-nextest
           pkgs.ripgrep
           pkgs.rust-analyzer
+          pkgs.sqlite
         ];
       };
     });