mod - getting nix to build cardano-tx-body.

I'm not entirely sure how to use nix.  I hope that someone with a good eye for this stuff takes a look at this commit.

default.nix

@@ -61,6 +61,8 @@ let
     # Grab the executable component of our package.
     inherit (self.haskellPackages.cardano-db-sync.components.exes)
       cardano-db-sync;
+    inherit (self.haskellPackages.cardano-db-sync.components.exes)
+      cardano-tx-body;
     inherit (self.haskellPackages.cardano-db-sync-extended.components.exes)
       cardano-db-sync-extended;
 

nix/haskell.nix

@@ -69,6 +69,11 @@ let
           subDir = "cardano-db-sync";
           name = "cardano-db-sync";
         };
+        packages.cardano-tx-body.src = haskell-nix.haskellLib.cleanGit {
+          src = ../.;
+          subDir = "cardano-db-sync";
+          name = "cardano-tx-body";
+        };
         packages.cardano-db-sync-extneded.src = haskell-nix.haskellLib.cleanGit {
           src = ../.;
           subDir = "cardano-db-sync-extended";
@@ -84,6 +89,7 @@ let
         # split data output for ekg to reduce closure size
         packages.ekg.components.library.enableSeparateDataOutput = true;
         packages.cardano-db-sync.configureFlags = [ "--ghc-option=-Wall" "--ghc-option=-Werror" ];
+        packages.cardano-tx-body.configureFlags = [ "--ghc-option=-Wall" "--ghc-option=-Werror" ];
         packages.cardano-db-sync-extended.configureFlags = [ "--ghc-option=-Wall" "--ghc-option=-Werror" ];
         enableLibraryProfiling = profiling;
       }
@@ -99,6 +105,10 @@ let
           # todo, this shrinks the docker image by ~100mb
           #dontStrip = false;
         };
+        packages.cardano-tx-body.components.exes.cardano-tx-body = {
+          # todo, this shrinks the docker image by ~100mb
+          #dontStrip = false;
+        };
       }
     ];
     pkg-def-extras = [

shell.nix

@@ -16,6 +16,7 @@ let
 
     packages = ps: with ps; [
        ps.cardano-db-sync
+       ps.cardano-tx-body
        ps.cardano-db-sync-extended
     ];