Complete conda-recipes Overhaul

.github/workflows/build_packages.yml

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+name: Build Packages
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+  workflow_dispatch:
+  push:
+    branches:
+      - stable
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-13, macos-latest, windows-latest]
+        recipe: [symmetry]
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash -l {0}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Conda
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: false
+          conda-solver: libmamba
+          auto-activate-base: true
+          activate-environment: ""
+      - name: Install Build Tools
+        run: conda install python anaconda-client conda-build
+      - name: Configure Auto-Upload
+        if: github.ref == 'refs/heads/stable'
+        run: |
+          conda config --set anaconda_upload yes
+      - name: Build Binary
+        run: |
+          # set a default value to the conda_token if needed (like from forks)
+          : "${CONDA_TOKEN:=${{ secrets.ANACONDA_TOKEN }}}"
+          : "${CONDA_TOKEN:=default_value}"
+          echo "CONDA_TOKEN=$CONDA_TOKEN" >> $GITHUB_ENV
+          conda config --add channels conda-forge
+          conda config --add channels rmg
+          conda build --token $CONDA_TOKEN --user rmg ${{ matrix.recipe }}
+  result:
+    if: ${{ always() }}
+    runs-on: ubuntu-latest
+    name: Final Results
+    needs: [build]
+    steps:
+      - run: exit 1
+        # see https://github.com/orgs/community/discussions/26822?sort=new#discussioncomment-8285141
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') || contains(needs.*.result, 'skipped') }}

.gitignore

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-*~
-*.swp
-*.idea/

README.md

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 # Conda Recipes for RMG-Py dependencies
 
-Example recipes for the new conda build system.  Use
+Example recipes for the conda build system.
+Run `conda build <recipe directory>`.
 
-    conda build <recipe directory>
-
-You have to use conda >= 1.7
-[conda](https://github.com/continuumio/conda).
-
-See http://docs.continuum.io/conda/build.html for information on how to make a recipe,
-or just look at the examples here.
+You have to use `conda >=  23.1.0` - see the [installation instructions](https://docs.anaconda.com/free/anaconda/install/).
 
+See [the `conda` documentation](https://docs.conda.io/projects/conda-build/en/latest/user-guide/tutorials/build-pkgs.html) for information on how to make a recipe or just look at the examples here.