Give builds a name

.github/workflows/build.yml

@@ -32,8 +32,14 @@ jobs:
     steps:
       - name: Download artifacts
         uses: https://gitea.com/actions/download-artifact@v3-node20
+      - id: date
+        name: Generate date
+        run: |-
+          nix build coreutils
+          echo "DATE=$(./result/bin/date +'%Y-%m-%d-%H')" >> "$GITHUB_OUTPUT"
       - name: Create release
         uses: https://gitea.com/actions/gitea-release-action@v1
         with:
+          tag_name: ${{ steps.date.outputs.DATE }}
           files: |-
             "*.tar.xz"