Add conda packaging recipe and scheduled Anaconda.org upload workflow

.github/workflows/conda.yml

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+name: Conda Build and Upload
+
+on:
+  schedule:
+    - cron: '0 0 * * 0'  # Run weekly on Sunday at midnight UTC
+  push:
+    branches: [master]
+    tags:
+      - 'v*'
+  workflow_dispatch:  # Allow manual triggering
+
+jobs:
+  conda-build:
+    name: Build and Upload Conda Package
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Full history needed for git describe
+
+      - name: Set up Miniconda
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: true
+          python-version: '3.12'
+          channels: conda-forge,defaults
+          channel-priority: strict
+
+      - name: Install conda-build and anaconda-client
+        shell: bash -l {0}
+        run: |
+          conda install -y conda-build anaconda-client
+
+      - name: Determine package version
+        id: get_version
+        shell: bash -l {0}
+        run: |
+          # Use the most recent version tag, falling back to the version in CMakeLists.txt
+          TAG_VERSION=$(git describe --tags --abbrev=0 2>/dev/null | sed 's/^v//')
+          if [ -n "${TAG_VERSION}" ]; then
+            VERSION="${TAG_VERSION}"
+          else
+            MAJOR=$(grep -m1 'set(MADNESS_MAJOR_VERSION' CMakeLists.txt | grep -oE '[0-9]+')
+            MINOR=$(grep -m1 'set(MADNESS_MINOR_VERSION' CMakeLists.txt | grep -oE '[0-9]+')
+            MICRO=$(grep -m1 'set(MADNESS_MICRO_VERSION' CMakeLists.txt | grep -oE '[0-9]+')
+            VERSION="${MAJOR}.${MINOR}.${MICRO}"
+          fi
+          echo "GIT_DESCRIBE_TAG=${VERSION}" >> $GITHUB_ENV
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "Package version: ${VERSION}"
+
+      - name: Build Conda Package
+        shell: bash -l {0}
+        run: |
+          conda build conda-recipe/ \
+            --no-test \
+            --output-folder ${{ github.workspace }}/conda-dist/
+
+      - name: Upload to Anaconda.org
+        if: |
+          github.event_name == 'schedule' ||
+          github.event_name == 'workflow_dispatch' ||
+          startsWith(github.ref, 'refs/tags/')
+        shell: bash -l {0}
+        env:
+          ANACONDA_TOKEN: ${{ secrets.ANACONDA_TOKEN }}
+        run: |
+          # Upload all built packages (both .conda and legacy .tar.bz2 formats)
+          find ${{ github.workspace }}/conda-dist/ \( -name '*.conda' -o -name '*.tar.bz2' \) | \
+            xargs -r -I{} anaconda -t "${ANACONDA_TOKEN}" upload --force {}
+
+      - name: Upload conda package as workflow artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: conda-package-${{ steps.get_version.outputs.version }}
+          path: ${{ github.workspace }}/conda-dist/**/*.conda
+          if-no-files-found: warn

conda-recipe/.gitignore

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+!build.sh

conda-recipe/build.sh

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+#!/bin/bash
+set -ex
+
+mkdir -p build
+cd build
+
+cmake ${CMAKE_ARGS} \
+  -G Ninja \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DCMAKE_INSTALL_PREFIX="${PREFIX}" \
+  -DCMAKE_PREFIX_PATH="${PREFIX}" \
+  -DBUILD_SHARED_LIBS=OFF \
+  -DBUILD_TESTING=OFF \
+  -DMADNESS_TASK_BACKEND=Pthreads \
+  -DMPI_CXX_SKIP_MPICXX=ON \
+  -DMPIEXEC_PREFLAGS='--allow-run-as-root' \
+  ..
+
+ninja install

conda-recipe/meta.yaml

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+{% set version = environ.get('GIT_DESCRIBE_TAG', 'dev') %}
+
+package:
+  name: madness
+  version: {{ version }}
+
+source:
+  path: ..
+
+build:
+  number: 0
+  skip: true  # [win]
+  script_env:
+    - OMPI_ALLOW_RUN_AS_ROOT=1
+    - OMPI_ALLOW_RUN_AS_ROOT_CONFIRM=1
+
+requirements:
+  build:
+    - {{ compiler('cxx') }}
+    - {{ compiler('c') }}
+    - {{ compiler('fortran') }}
+    - cmake >=3.12
+    - ninja
+    - make
+  host:
+    - openmpi
+    - libblas
+    - liblapack
+  run:
+    - openmpi
+    - libblas
+    - liblapack
+
+test:
+  commands:
+    - test -f $PREFIX/include/madness/world/world.h  # [unix]
+    - test -f $PREFIX/lib/libMADworld.a  # [unix]
+
+about:
+  home: https://madness.readthedocs.io/
+  license: GPL-2.0-or-later
+  license_file: LICENSE
+  summary: 'MADNESS: Multiresolution Adaptive Numerical Environment for Scientific Simulation'
+  description: |
+    MADNESS (Multiresolution Adaptive Numerical Environment for Scientific Simulation)
+    provides a high-level environment for the solution of integral and differential
+    equations in many dimensions using adaptive, fast methods with guaranteed precision
+    based on multi-resolution analysis and novel separated representations.
+  dev_url: https://github.com/m-a-d-n-e-s-s/madness
+  doc_url: https://madness.readthedocs.io/
+
+extra:
+  recipe-maintainers:
+    - m-a-d-n-e-s-s