Modify conda installation and build steps in workflow

Try to address build bug where conda build is not found, using CoPilot suggestion. While at it, switch to latest version of constructor.

Author: briantoby

.github/workflows/g2main-test.yml

@@ -40,20 +40,21 @@ jobs:
           # do this here so it is not buried in the .yml
           #conda install constructor=3.11.2   
           #conda install constructor=3.9
-          conda install conda-standalone=24.9.2 # works with constructor 3.11.1
+          # 5/6/26 removing next line to use the lastest constructor now that 3.15 is out
+          #conda install conda-standalone=24.9.2 # works with constructor 3.11.1
 
       - name: create gsas2main conda package
         shell: bash -l {0}
         run: |
+          conda activate conda
           cd install
+          python GSAS2main/makeBldFiles.py
           if [ "$RUNNER_OS" == "Windows" ]; then
              echo "Windows build"
-             python GSAS2main/makeBldFiles.py
              conda config --set anaconda_upload yes
              conda build GSAS2main --output-folder C:/tmp/builds --user briantoby  --token ${{ secrets.ANACONDA_TOKEN }}
           else
              echo "Unix build"
-             python GSAS2main/makeBldFiles.py
              conda build GSAS2main --output-folder ~/build # use below due to patch above
              #conda build GSAS2main --output-folder ~/build --package-format .conda
              anaconda -t ${{ secrets.ANACONDA_TOKEN }} upload ~/build/*/*.conda --user briantoby --force