Add benchmarking with codspeed

.github/workflows/codspeed.yml

@@ -0,0 +1,36 @@
+name: CodSpeed
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+  workflow_dispatch:
+
+env:
+  UV_SYSTEM_PYTHON: 1
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+jobs:
+  benchmarks:
+    name: Run benchmarks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+      - run: |
+          uv pip install ".[dev, everest]"
+          uv pip uninstall pytest-benchmark
+          uv pip install pytest-codspeed
+      - uses: CodSpeedHQ/action@v3
+        with:
+          token: ${{ secrets.CODSPEED_TOKEN }}
+          run: |
+            pytest tests/ert/performance_tests --codspeed --timeout=1200