use nix provided bitcoind in flake checks

Author: nothingmuch

flake.nix

@@ -155,12 +155,8 @@
               inherit cargoArtifacts;
               partitions = 1;
               partitionType = "count";
-              # TODO also run integration tests
-              # this needs --all-features to enable io,_manual-tls features
-              # unfortunately this can't yet work because running docker inside the nix sandbox is not possible,
-              # which precludes use of the redis test container
-              # cargoExtraArgs = "--locked --all-features";
-              # buildInputs = [ pkgs.bitcoind ]; # not verified to work
+              cargoExtraArgs = "--locked --all-features";
+              BITCOIND_EXE = nixpkgs.lib.getExe' pkgs.bitcoind "bitcoind";
             }
           );
 
@@ -170,6 +166,8 @@
               cargoArtifacts = craneLibVersions.msrv.buildDepsOnly commonArgs;
               partitions = 1;
               partitionType = "count";
+              cargoExtraArgs = "--locked --all-features";
+              BITCOIND_EXE = nixpkgs.lib.getExe' pkgs.bitcoind "bitcoind";
             }
           );