add check job to CI, remove caching

.github/workflows/ci.yml

@@ -40,14 +40,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
-    - uses: actions/cache@v3
-      id: cache
-      with:
-        path: ${{ env.pythonLocation }}
-        key: v2-${{ runner.os }}-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml') }}-${{ hashFiles('requirements/tests.txt') }}
-
     - run: pip install -r requirements/tests.txt -r requirements/pyproject.txt
-      if: steps.cache.outputs.cache-hit != 'true'
 
     - run: make test
 
@@ -68,14 +61,7 @@ jobs:
       with:
         python-version: '3.10'
 
-    - uses: actions/cache@v3
-      id: cache
-      with:
-        path: ${{ env.pythonLocation }}
-        key: ${{ env.pythonLocation }}-${{ hashFiles('requirements/linting.txt') }}-${{ hashFiles('pyproject.toml') }}
-
     - run: pip install -r requirements/linting.txt
-      if: steps.cache.outputs.cache-hit != 'true'
 
     - uses: pre-commit/action@v3.0.0
       with:
@@ -109,11 +95,20 @@ jobs:
         name: docs
         path: site
 
+  check:  # This job does nothing and is only used for the branch protection
+    if: always()
+    needs: [lint, test, docs]
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Decide whether the needed jobs succeeded or failed
+        uses: re-actors/alls-green@release/v1
+        id: all-green
+        with:
+          jobs: ${{ toJSON(needs) }}
+
   deploy:
-    needs:
-      - test
-      - lint
-      - docs
+    needs: [check]
     if: "success() && startsWith(github.ref, 'refs/tags/')"
     runs-on: ubuntu-latest