adding back conda and flake8

.github/workflows/materialization_ci.yml

@@ -43,4 +43,21 @@ jobs:
           key: ${{ runner.os }}-pip-${{ hashFiles('**/test_requirements.txt') }}
           restore-keys: |
             ${{ runner.os }}-pip-
-     
+      - uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: true
+          auto-activate-base: true
+          python-version: 3.9
+      - name: Install dependencies
+        shell: bash -l {0}
+        run: |
+          pip install flake8 pytest
+          pip install -r requirements.txt
+          if [ -f test_requirements.txt ]; then pip install -r test_requirements.txt; fi
+      - name: Lint with flake8
+        shell: bash -l {0}
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          # flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics