split the python-only test into separate CI to simplify reg test logic

Author: JacksonBurns

.github/workflows/CI.yml

@@ -57,9 +57,8 @@ jobs:
       matrix:
         python-version: ["3.9"]
         os: [macos-13, macos-latest, ubuntu-latest]
-        test_julia: [yes, no]
     runs-on: ${{ matrix.os }}
-    name: ${{ matrix.os }} Build and Test Python ${{ matrix.python-version }} (Julia? ${{ matrix.test_julia }})
+    name: ${{ matrix.os }} Build and Test Python ${{ matrix.python-version }}
     # skip scheduled runs from forks
     if: ${{ !( github.repository != 'ReactionMechanismGenerator/RMG-Py' && github.event_name == 'schedule' ) }}
     env: 
@@ -115,7 +114,6 @@ jobs:
 
       # Setup Juliaup
       - name: Set Julia paths
-        if: matrix.test_julia == 'yes'
         run: |
           # echo "JULIAUP_DEPOT_PATH=$CONDA/envs/rmg_env/.julia" >> $GITHUB_ENV
           # echo "JULIAUP_DEPOT_PATH=$CONDA/envs/rmg_env/.julia" >> $GITHUB_PATH
@@ -129,18 +127,15 @@ jobs:
           # echo "JULIA_CONDAPKG_BACKEND=Current" >> $GITHUB_PATH
 
       - name: Setup Juliaup
-        if: matrix.test_julia == 'yes'
         uses: julia-actions/install-juliaup@v2
         with:
           channel: '1.9'
 
       - name: Check Julia version
-        if: matrix.test_julia == 'yes'
         run: julia --version
 
       # RMS installation and linking to Julia
       - name: Install and link Julia dependencies
-        if: matrix.test_julia == 'yes'
         timeout-minutes: 120 # this usually takes 20-45 minutes (or hangs for 6+ hours).
         # JULIA_CONDAPKG_EXE points to the existing conda/mamba to avoid JuliaCall from installing their own. See https://juliapy.github.io/PythonCall.jl/stable/pythoncall/#If-you-already-have-a-Conda-environment.
         run: |

.github/workflows/pure_python_ci.yml

@@ -0,0 +1,93 @@
+# Pure Python CI
+# Runs a reduced set of tests compared to CI.yml, skips CD altogether, ensure pure-python
+# mode (i.e. no Julia-based dependencies) works.
+
+name: Pure Python Continuous Integration
+
+on:
+  schedule:
+    # * is a special character in YAML so you have to quote this string
+    - cron: "0 8 * * *"
+  # allow running on RMG-Py on a pushed branch, only if triggered manually
+  workflow_dispatch:
+  # runs on PRs against RMG-Py (and anywhere else, but we add this for RMG-Py)
+  pull_request:
+
+# this prevents one PR from simultaneously running multiple runners, which will clog up the queue
+# and prevent other PRs from running the CI
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  # if running on RMG-Py but requiring changes on an un-merged branch of RMG-database, replace
+  # main with the name of the branch
+  RMG_DATABASE_BRANCH: main
+
+
+jobs:
+  build-and-test:
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.9"]
+        os: [macos-13, macos-latest, ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.os }} Build and Minimal Test Python ${{ matrix.python-version }}
+    # skip scheduled runs from forks
+    if: ${{ !( github.repository != 'ReactionMechanismGenerator/RMG-Py' && github.event_name == 'schedule' ) }}
+    defaults:
+      run:
+        shell: bash -l {0}
+    steps:
+      - name: Checkout RMG-Py
+        uses: actions/checkout@v4
+
+      - name: Compel Arm-based Mac to use x86
+        if: matrix.os == 'macos-latest'
+        run: echo "CONDA_SUBDIR=osx-64" >> $GITHUB_ENV
+
+      - name: Setup Miniforge Python ${{ matrix.python-version }}
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          environment-file: environment.yml
+          miniforge-variant: Miniforge3
+          miniforge-version: latest
+          python-version: ${{ matrix.python-version }}
+          activate-environment: rmg_env
+          use-mamba: true
+          show-channel-urls: true
+          channels: conda-forge,cantera,rmg
+
+      # list the environment for debugging purposes
+      - name: mamba info
+        run: |
+          mamba info
+          mamba list
+
+      # Clone RMG-database
+      - name: Clone RMG-database
+        run: |
+          cd ..
+          git clone -b $RMG_DATABASE_BRANCH https://github.com/ReactionMechanismGenerator/RMG-database.git
+
+      # modify env variables as directed in the RMG installation instructions
+      - name: Set Environment Variables
+        run: |
+          RUNNER_CWD=$(pwd)
+          echo "PYTHONPATH=$RUNNER_CWD/RMG-Py:$PYTHONPATH" >> $GITHUB_ENV
+          echo "$RUNNER_CWD/RMG-Py" >> $GITHUB_PATH
+
+      # RMG build step
+      - name: make RMG
+        run: |
+          make clean
+          make
+
+      - name: Install Q2DTor
+        run: echo "" | make q2dtor
+
+      # non-regression testing
+      - name: Run Unit, Functional, and Database Tests
+        # aggregate into one command so we only have to eat the collection time once
+        run: make test-all