chore: import upstream snapshot with attribution

.github/workflows/github_release.yml

@@ -0,0 +1,104 @@
+name: Project release on Github
+
+on:
+  workflow_dispatch:  # this is useful to re-generate the release page without a new tag being pushed
+  push:
+    tags:
+      - "v2.[0-9]+.[0-9]+*"
+      # Ignore release versions tagged with -rc0 suffix
+      - "!v2.[0-9]+.[0-9]-rc0"
+
+permissions:
+  contents: read
+
+jobs:
+  generate-notes:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write  # ncipollo/release-action creates the GitHub release
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          fetch-tags: true
+          fetch-depth: 0  # slow but needed by reno
+
+      - name: Parse version
+        id: version
+        run: |
+          echo "current_release=$(awk -F \\- '{print $1}' < VERSION.txt)" >> "$GITHUB_OUTPUT"
+          echo "current_pre_release=$(awk -F \\- '{print $2}' < VERSION.txt)" >> "$GITHUB_OUTPUT"
+
+      - name: Install reno
+        run: |
+          python -m pip install --upgrade pip
+          pip install "reno<5" --uploaded-prior-to=P1D
+
+      # Remove next version rc0 tag in the CI environment to prevent reno from assigning notes to future releases.
+      # This ensures release notes are correctly aggregated for the current version.
+      # This is a workaround. Can be removed if the release process is fully aligned with reno.
+      - name: Delete next version rc0 tag in the CI environment
+        run: |
+          # Parse version X.Y.Z and increment Y for next minor version
+          IFS='.' read -r MAJOR MINOR _ <<< "${{ steps.version.outputs.current_release }}"
+          NEXT_MINOR=$((MINOR + 1))
+          NEXT_TAG="v${MAJOR}.${NEXT_MINOR}.0-rc0"
+
+          if git rev-parse --verify "$NEXT_TAG" >/dev/null 2>&1; then
+            git tag -d "$NEXT_TAG"
+            echo "Deleted local tag $NEXT_TAG"
+          else
+            echo "Tag $NEXT_TAG does not exist locally"
+          fi
+
+      - name: Generate release notes
+        env:
+
+          EARLIEST_VERSION: v${{ steps.version.outputs.current_release }}-rc1
+        run: |
+          reno report --no-show-source --ignore-cache --earliest-version "$EARLIEST_VERSION" -o relnotes.rst
+
+      - name: Convert to Markdown
+        uses: docker://pandoc/core:3.8@sha256:c7127705b9d84c1b4acbbe411a86e3a6d67ac57870654dc378b6fe636ab747df
+        with:
+          args: "--from rst --to gfm --syntax-highlighting=none --wrap=none relnotes.rst -o relnotes.md"
+
+      # We copy the relnotes file since the original one cannot be modified due to permissions
+      - name: Copy relnotes file
+        run: |
+          cat relnotes.md > enhanced_relnotes.md
+
+      - name: Add contributor list
+          # only for minor releases and minor release candidates (not bugfix releases)
+        if: endsWith(steps.version.outputs.current_release, '.0')
+        env:
+          GH_TOKEN: ${{ github.token }}
+          START: v${{ steps.version.outputs.current_release }}-rc0
+          END: ${{ github.ref_name }}
+        run: |
+          JQ_EXPR='[.commits[].author.login]
+            | map(select(. != null and . != "HaystackBot" and . != "dependabot[bot]" and . != "github-actions[bot]"))
+            | unique
+            | sort_by(ascii_downcase)
+            | map("@\(.)")
+            | join(", ")'
+          CONTRIBUTORS=$(gh api "repos/deepset-ai/haystack/compare/$START...$END" \
+            --jq "$JQ_EXPR") || { echo "Unable to fetch contributors"; exit 1; }
+
+          {
+            echo ""
+            echo "## 💙 Big thank you to everyone who contributed to this release!"
+            echo ""
+            echo "$CONTRIBUTORS"
+          } >> enhanced_relnotes.md
+
+      - name: Debug
+        run: |
+          cat enhanced_relnotes.md
+
+      - uses: ncipollo/release-action@339a81892b84b4eeb0f6e744e4574d79d0d9b8dd # v1.21.0
+        with:
+          bodyFile: "enhanced_relnotes.md"
+          prerelease: ${{ steps.version.outputs.current_pre_release != '' }}
+          allowUpdates: true