[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 +16,12 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Create a pre-release
+        env:
+          OVERWRITE_RELEASE: true
         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"