Implement nightly prerelease

.github/workflows/nightly-tests.yml

@@ -94,6 +94,7 @@ jobs:
       - name: Upload ${{ matrix.preset }}.tar.gz
         uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
+          name: ${{ matrix.preset }}.tar.gz
           path: ${{ matrix.preset }}.tar.gz
           archive: false
 
@@ -109,3 +110,54 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           GH_REPO: ${{ github.repository }}
+
+  publish:
+    if: github.event_name == 'schedule' || (github.event.inputs.ref == 'master' && github.event.inputs.repo == 'ethereum/consensus-specs')
+    needs: [package]
+    runs-on: [self-hosted-ghr-custom, size-s-x64, profile-consensusSpecs]
+    concurrency:
+      group: nightly-release-publish
+      cancel-in-progress: false
+    permissions:
+      contents: write
+      actions: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          repository: ${{ inputs.repo }}
+          ref: ${{ inputs.ref }}
+
+      - name: Download packaged artifacts
+        uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
+        with:
+          pattern: "*.tar.gz"
+          merge-multiple: true
+
+      - name: Generate metadata
+        id: meta
+        run: |
+          run_date=$(gh api "/repos/${{ github.repository }}/actions/runs/${{ github.run_id }}" \
+            --jq '.run_started_at | split("T")[0]')
+          echo "date=nightly-${run_date}" >> "$GITHUB_OUTPUT"
+          sha256sum general.tar.gz minimal.tar.gz mainnet.tar.gz > checksums.txt
+          echo "nightly-${run_date}" > version.txt
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Publish nightly release
+        run: |
+          git tag -f nightly
+          git push origin nightly --force
+          if ! gh release view nightly >/dev/null 2>&1; then
+            gh release create nightly --target ${{ github.sha }} --prerelease --title "Nightly" --notes ""
+          fi
+          gh release upload nightly --clobber \
+            general.tar.gz minimal.tar.gz mainnet.tar.gz checksums.txt version.txt
+          gh release edit nightly \
+            --prerelease \
+            --title "Nightly (${{ steps.meta.outputs.date }})" \
+            --notes "Reference test vectors from \`$(git rev-parse --short HEAD)\` on \`master\`."
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}