WIP: trying to solve pip problem

.github/workflows/builds.yml

@@ -33,7 +33,6 @@ jobs:
         run: |
           sudo apt update
           sudo apt install cmake ninja-build libgtest-dev
-          pip install -r requirements.txt
       - name: Install LLVM
         run: |
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
@@ -46,14 +45,14 @@ jobs:
         run: |
           cmake -S . -B build -GNinja -DCMAKE_BUILD_TYPE=Release
           sudo ninja -C build install
-          pip install .
           sudo install -m 0755 bin/diffkemp /usr/bin/diffkemp
       - name: Development build of DiffKemp
         if: ${{ matrix.build-type == 'development' }}
         run: |
           cmake -S . -B build -GNinja
           sudo ninja -C build
-          pip install -e .
+          pip install .
+          pip inject diffkemp -r requirements.txt
       - name: Check by building and comparing make-based project
         run: |
           ${{matrix.diffkemp-bin}} build tests/testing_projects/make_based/ old-snapshot
@@ -82,8 +81,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Pip3 backup
-        run: python3 -m pip install pip -U
       - name: RPython installation
         run: |
           sudo apt install python2 python-pip