Add python initialization and dependency install to CI

.github/workflows/push_ci.yml

@@ -1,4 +1,8 @@
-on: push
+on:
+  push:
+    branches:
+      - dev
+      - test-ci
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -7,6 +11,26 @@ jobs:
       - run: |
           git config user.name github-actions
           git config user.email [email protected]
-          python ./workshop_git_tools/process_repo.py
-          git commit -m "generated"
-          git push
+      - name: Cache conda
+        uses: actions/cache@v3
+        env:
+          # Increase this value to reset cache if etc/example-environment.yml has not changed
+          CACHE_NUMBER: 2
+        with:
+          path: ~/conda_pkgs_dir
+          key:
+            ${{ matrix.os }}-python_${{ matrix.python-version }}-${{ env.CACHE_NUMBER }}-${{ hashFiles('etc/example-environment.yml') }}
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          miniforge-variant: Mambaforge
+          use-mamba: true
+          auto-update-conda: true
+          channels: conda-forge,
+      - name: Install dependencies
+        run: |
+          mamba env create -f environment.yml
+          conda activate cadet_workshop
+      - name: Generate teaching and solution branches
+        run: |
+          python ./workshop_git_tools/process_repo.py --commit --push