diff --git a/.github/workflows/release-artifacts-tchap.yml b/.github/workflows/release-artifacts-tchap.yml
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+++ b/.github/workflows/release-artifacts-tchap.yml
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+# GitHub actions workflow which builds the release artifacts.
+
+name: Build Tchap release artifacts
+
+on:
+  # we build on PRs and develop to (hopefully) get early warning
+  # of things breaking (but only build one set of debs). PRs skip
+  # building wheels on macOS & ARM.
+  pull_request:
+  push:
+    branches: ["develop_tchap"]
+
+  # we do the full build on releases.
+  release:
+    types: [published]
+  merge_group:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: write
+
+jobs:
+  get-distros:
+    name: "Calculate list of debian distros"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+      - id: set-distros
+        run: |
+          # if we're running from a tag, get the full list of distros; otherwise just use debian:sid
+          # NOTE: inside the actual Dockerfile-dhvirtualenv, the image name is expanded into its full image path
+          dists='["debian:sid"]'
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+              dists=$(scripts-dev/build_debian_packages.py --show-dists-json)
+          fi
+          echo "distros=$dists" >> "$GITHUB_OUTPUT"
+    # map the step outputs to job outputs
+    outputs:
+      distros: ${{ steps.set-distros.outputs.distros }}
+
+### Deactivate pipeline : not required for Tchap Synapse ###
+#  # now build the packages with a matrix build.
+#  build-debs:
+#    needs: get-distros
+#    name: "Build .deb packages"
+#    runs-on: ubuntu-latest
+#    strategy:
+#      matrix:
+#        distro: ${{ fromJson(needs.get-distros.outputs.distros) }}
+#
+#    steps:
+#      - name: Checkout
+#        uses: actions/checkout@v4
+#        with:
+#          path: src
+#
+#      - name: Set up Docker Buildx
+#        id: buildx
+#        uses: docker/setup-buildx-action@v3
+#        with:
+#          install: true
+#
+#      - name: Set up docker layer caching
+#        uses: actions/cache@v3
+#        with:
+#          path: /tmp/.buildx-cache
+#          key: ${{ runner.os }}-buildx-${{ github.sha }}
+#          restore-keys: |
+#            ${{ runner.os }}-buildx-
+#
+#      - name: Set up python
+#        uses: actions/setup-python@v5
+#        with:
+#          python-version: '3.x'
+#
+#      - name: Build the packages
+#        # see https://github.com/docker/build-push-action/issues/252
+#        # for the cache magic here
+#        run: |
+#          ./src/scripts-dev/build_debian_packages.py \
+#            --docker-build-arg=--cache-from=type=local,src=/tmp/.buildx-cache \
+#            --docker-build-arg=--cache-to=type=local,mode=max,dest=/tmp/.buildx-cache-new \
+#            --docker-build-arg=--progress=plain \
+#            --docker-build-arg=--load \
+#            "${{ matrix.distro }}"
+#          rm -rf /tmp/.buildx-cache
+#          mv /tmp/.buildx-cache-new /tmp/.buildx-cache
+#
+#      - name: Upload debs as artifacts
+#        uses: actions/upload-artifact@v4
+#        with:
+#          name: debs
+#          path: debs/*
+
+  build-wheels:
+    name: Build wheels on ${{ matrix.os }} for ${{ matrix.arch }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+### Deactivate pipeline : not required for Tchap Synapse ###
+#        os: [ubuntu-20.04, macos-11]
+        os: [ubuntu-20.04]
+### Deactivate pipeline : not required for Tchap Synapse ###
+#        arch: [x86_64, aarch64]
+        arch: [x86_64]
+        # is_pr is a flag used to exclude certain jobs from the matrix on PRs.
+        # It is not read by the rest of the workflow.
+        is_pr:
+          - ${{ startsWith(github.ref, 'refs/pull/') }}
+
+        exclude:
+          # Don't build macos wheels on PR CI.
+          - is_pr: true
+            os: "macos-11"
+          # Don't build aarch64 wheels on mac.
+          - os: "macos-11"
+            arch: aarch64
+          # Don't build aarch64 wheels on PR CI.
+          - is_pr: true
+            arch: aarch64
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          # setup-python@v4 doesn't impose a default python version. Need to use 3.x
+          # here, because `python` on osx points to Python 2.7.
+          python-version: "3.x"
+
+      - name: Install cibuildwheel
+        run: python -m pip install cibuildwheel==2.16.2
+
+      - name: Set up QEMU to emulate aarch64
+        if: matrix.arch == 'aarch64'
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+
+      - name: Build aarch64 wheels
+        if: matrix.arch == 'aarch64'
+        run: echo 'CIBW_ARCHS_LINUX=aarch64' >> $GITHUB_ENV
+
+      - name: Only build a single wheel on PR
+        if: startsWith(github.ref, 'refs/pull/')
+        run: echo "CIBW_BUILD="cp38-manylinux_${{ matrix.arch }}"" >> $GITHUB_ENV
+
+      - name: Build wheels
+        run: python -m cibuildwheel --output-dir wheelhouse
+        env:
+### Deactivate pipeline : not required for Tchap Synapse ###
+          CIBW_SKIP: cp36-* cp37-* pp3*-* *i686* *musl*
+          # Skip testing for platforms which various libraries don't have wheels
+          # for, and so need extra build deps.
+          CIBW_TEST_SKIP: pp3*-* *i686* *musl*
+          # Fix Rust OOM errors on emulated aarch64: https://github.com/rust-lang/cargo/issues/10583
+          CARGO_NET_GIT_FETCH_WITH_CLI: true
+          CIBW_ENVIRONMENT_PASS_LINUX: CARGO_NET_GIT_FETCH_WITH_CLI
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: Wheel
+          path: ./wheelhouse/*.whl
+
+  build-sdist:
+    name: Build sdist
+    runs-on: ubuntu-latest
+    if: ${{ !startsWith(github.ref, 'refs/pull/') }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - run: pip install build
+
+      - name: Build sdist
+        run: python -m build --sdist
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: Sdist
+          path: dist/*.tar.gz
+
+
+  # if it's a tag, create a release and attach the artifacts to it
+  attach-assets:
+    name: "Attach assets to release"
+    if: ${{ !failure() && !cancelled() && startsWith(github.ref, 'refs/tags/') }}
+    needs:
+### Deactivate pipeline : not required for Tchap Synapse ###
+#      - build-debs
+      - build-wheels
+      - build-sdist
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download all workflow run artifacts
+        uses: actions/download-artifact@v4
+### Deactivate pipeline : not required for Tchap Synapse ###
+#      - name: Build a tarball for the debs
+#        run: tar -cvJf debs.tar.xz debs
+      - name: Attach to release
+        uses: softprops/action-gh-release@a929a66f232c1b11af63782948aa2210f981808a  # PR#109
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          files: |
+            Sdist/*
+            Wheel/*
+### Deactivate pipeline : not required for Tchap Synapse ###
+#            debs.tar.xz
+          # if it's not already published, keep the release as a draft.
+          draft: true
+          # mark it as a prerelease if the tag contains 'rc'.
+          prerelease: ${{ contains(github.ref, 'rc') }}