[Chore] Fix autoreleasing CI job

Problem: After a recent switch to GitHub Actions, job that creates
prerelease suddenly stopped working.

Solution: Switch to the autoreleasing script from serokell.nix
which uses 'gh' instead of 'hub'.

.github/workflows/autorelease.yml

@@ -16,12 +16,13 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Create a pre-release
+        env:
+          OVERWRITE_RELEASE: true
+        # https://github.com/serokell/serokell.nix/blob/c1e2a33040438443c7721523e897db5e32a52a74/overlay/github.nix#L26
         run: |
-          export GITHUB_TOKEN=${{ env.GITHUB_TOKEN }}
-          nix shell .#curl .#gitAndTools.hub -c bash -c "curl https://raw.githubusercontent.com/serokell/scratch/release-binary/scripts/release-binary.sh | bash"
+          nix run .#github.autorelease -- "$(nix-build ./release)" "Automatic release on "$(date +\"%Y%m%d%H%M\")""
 
       - name: Push latest image to dockerhub
         run: |
-          export DOCKERHUB_PASSWORD=${{ env.DOCKERHUB_PASSWORD }}
           nix build -L .#docker-image
           nix shell .#skopeo -c ./scripts/upload-docker-image.sh "docker-archive:$(readlink result)" "docker://docker.io/serokell/xrefcheck:latest"

flake.nix

@@ -60,7 +60,6 @@
           apps.default = self.apps.${system}."x86_64-unknown-linux-musl:xrefcheck:exe:xrefcheck";
 
           packages = {
-
             default = self.packages.${system}.xrefcheck;
 
             xrefcheck = self.packages.${system}."xrefcheck:exe:xrefcheck";

release/default.nix

@@ -4,7 +4,7 @@
 let
   defaultNix = import ../default.nix;
 in
-{ pkgs ? defaultNix.legacyPackages, timestamp }:
+{ pkgs ? defaultNix.legacyPackages }:
 let
   xrefcheck-x86_64-linux = defaultNix.packages.xrefcheck-static;
 
@@ -25,14 +25,7 @@ let
     paths = [ "${xrefcheck-x86_64-windows}/bin" ];
   };
 
-  releaseNotes = pkgs.writeText "release-notes.md" ''
-    Automatic release on ${timestamp}
-  '';
 in pkgs.linkFarm "xrefcheck-release" [
-  {
-    name = "release-notes.md";
-    path = releaseNotes;
-  }
   {
     name = "xrefcheck-x86_64-linux";
     path = "${xrefcheck-x86_64-linux}/bin/xrefcheck";