update github actions

Author: jurgen-lentz

.github/workflows/build-package.yml

@@ -22,19 +22,12 @@ jobs:
         run: |
           sudo apt-get install --yes unzip
           unzip gcg.zip
-          ls -la
-
-      - name: Set up Python 3.9
-        uses: actions/setup-python@v2
-        with:
-          python-version: '3.9'
-          cache: 'pip'
-          cache-dependency-path: |
-            requirements.txt
+          export SCIPOPTDIR="$(pwd)/scip_install"
+          echo $SCIPOPTDIR
 
       - name: Prepare Python Environment
         run: |
-          pip install -r requirements.txt
+          pip install -r dev/requirements.txt
       
       - name: Build & Install PyGCGOpt
         run: |

dev/requirements.txt

@@ -0,0 +1,3 @@
+setuptools
+cython >=3.0.0
+pyscipopt==5.2.1