Filter uniond src and remove coreutils-full from uniond-image (c…

…loses unionlabs#637 (unionlabs#638)

- refactor(uniond): filter `src`
- fix(uniond-image): remove coreutils

uniond/uniond.nix

@@ -1,5 +1,5 @@
 { ... }: {
-  perSystem = { pkgs, self', crane, system, ensureAtRepositoryRoot, ... }:
+  perSystem = { pkgs, self', crane, system, ensureAtRepositoryRoot, nix-filter, ... }:
     let
       CGO_CFLAGS = "-I${pkgs.libblst}/include -I${pkgs.libblst.src}/src -I${pkgs.libblst.src}/build -I${self'.packages.bls-eth.src}/bls/include -O -D__BLST_PORTABLE__";
       CGO_LDFLAGS = "-z noexecstack -static -L${pkgs.musl}/lib -L${self'.packages.libwasmvm}/lib -L${self'.packages.bls-eth}/lib";
@@ -36,7 +36,15 @@
         else
           pkgs.buildGoModule) ({
           name = "uniond";
-          src = ./.;
+          src = nix-filter
+            {
+              name = "uniond-source";
+              root = ./.;
+              exclude = [
+                (nix-filter.matchExt "nix")
+                (nix-filter.matchExt "md")
+              ];
+            };
           vendorSha256 = null;
           doCheck = true;
           meta.mainProgram = "uniond";
@@ -66,7 +74,7 @@
 
           copyToRoot = pkgs.buildEnv {
             name = "image-root";
-            paths = [ pkgs.coreutils-full pkgs.cacert ];
+            paths = [ pkgs.cacert ];
             pathsToLink = [ "/bin" ];
           };
           config = {