install one at a time

Author: mrmundt

.github/workflows/test_branches.yml

@@ -346,10 +346,8 @@ jobs:
         conda list --show-channel-urls
         which python
         python --version
-        pip debug
         # We need setuptools so we can run Pyomo's setup.py
         conda install setuptools
-        pip debug
         # Note: some pypi packages are not available through conda
         PYOMO_DEPENDENCIES=`python setup.py dependencies \
             --extras "$EXTRAS" | tail -1`
@@ -382,6 +380,11 @@ jobs:
         fi
         # Note: this will fail the build if any installation fails (or
         # possibly if it outputs messages to stderr)
+        for DEP in $CONDA_DEPENDENCIES; do
+            echo "Installing $DEP..."
+            conda install --update-deps -q -y python="${{matrix.python}}" $DEP
+            pip debug
+        done
         conda install --update-deps -q -y python="${{matrix.python}}" $CONDA_DEPENDENCIES
         if test -z "${{matrix.slim}}"; then
             # xpress.init() (xpress 9.5.1 from conda) hangs indefinitely