Refactor PyRosetta installation steps in workflow

Author: lyskov

.github/workflows/pyrosetta_installer.yml

@@ -56,10 +56,31 @@ jobs:
         run: |
           python -m pip install --upgrade pip setuptools wheel
 
-      - name: Install PyRosetta using pyrosetta_installer
+#      - name: Install PyRosetta using pyrosetta_installer
+#        run: |
+#          pip install --no-cache-dir pyrosetta_installer
+#          python -c 'import pyrosetta_installer; pyrosetta_installer.install_pyrosetta(mirror=${{ matrix.mirror.mirror }}, distributed=${{ matrix.flavor.distributed }}, type="${{ matrix.flavor.type }}")'
+
+      - name: Install pyrosetta_installer
         run: |
           pip install --no-cache-dir pyrosetta_installer
-          python -c 'import pyrosetta_installer; pyrosetta_installer.install_pyrosetta(mirror=${{ matrix.mirror.mirror }}, distributed=${{ matrix.flavor.distributed }}, type="${{ matrix.flavor.type }}")'
+
+      - name: Install PyRosetta
+        env:
+          MIRROR: ${{ matrix.mirror.mirror }}
+          DISTRIBUTED: ${{ matrix.flavor.distributed }}
+          BUILD_TYPE: ${{ matrix.flavor.type }}
+        run: |
+          python - <<'PY'
+          import os
+          import pyrosetta_installer
+
+          pyrosetta_installer.install_pyrosetta(
+              mirror=int(os.environ["MIRROR"]),
+              distributed=int(os.environ["DISTRIBUTED"]),
+              type=os.environ["BUILD_TYPE"],
+          )
+          PY
 
       - name: Sanity check import + init
         run: |