Remove non-default conda solver setting

Author: inducer

ci-support.sh

@@ -419,9 +419,12 @@ install_conda_deps_inner()
     CONDA_EXE_DIR=$CONDA_INSTALL_DIR/bin
   fi
 
-  # This is the default, but it was set to non-default on the Gitlab CIs, and they
-  # 'remember' that. :/
-  PATH="$CONDA_EXE_DIR:$PATH" with_echo conda config --set solver classic
+  # This is to blow away any non-default solver settings that the Gitlab CIs
+  # may remember.
+  cat > $HOME/.condarc <<EOF
+channels:
+  - conda-forge
+EOF
   PATH="$CONDA_EXE_DIR:$PATH" with_echo conda update conda --yes --quiet
   PATH="$CONDA_EXE_DIR:$PATH" with_echo conda update --all --yes --quiet
   PATH="$CONDA_EXE_DIR:$PATH" with_echo conda env create --file "$CONDA_ENVIRONMENT" --name testing --quiet