ci: fix stuff

Author: yuuhikaze

.github/workflows/ci.yml

@@ -3,7 +3,9 @@ name: Simple CI
 # Triggers
 on:
   push:
+    branches: [ main ]
   pull_request:
+    branches: [ main ]
 
 # Jobs
 # with one CI pipeline multiple environment configurations can be validated
@@ -18,7 +20,9 @@ jobs:
         with:
           python-version: "3.11"
       - name: Install dependencies
-        run: pip install -r requirements.txt
+        run: |
+          python -m pip install --upgrade pip
+          pip install ruff
       - name: Run lint
         run: ruff check .
 
@@ -36,6 +40,8 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
-        run: pip install -r requirements.txt
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
       - name: Run tests
         run: pytest