WIP: ci: Plug in Eco-CI

HACK: We have to bump the image to a version that no longer supports
Python 3.6-3.8.

Let's see...

.github/workflows/next.yml

@@ -14,11 +14,16 @@ env:
 jobs:
   perform_tests:
     name: Run tests on kas code
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
     steps:
+      - name: Initialize Energy Estimation
+        uses: green-coding-solutions/eco-ci-energy-estimation@v3
+        with:
+          task: start-measurement
+
       - name: Check out repo
         uses: actions/checkout@v4
       - name: Set up Python
@@ -56,11 +61,28 @@ jobs:
                 $(python3 -c 'import site; print(site.getsitepackages()[0])')/
           ln -s /usr/local/lib/python${{ matrix.python-version }}/site-packages/snack.py \
                 $(python3 -c 'import site; print(site.getsitepackages()[0])')/
+
+      - name: Setup measurement
+        uses: green-coding-solutions/eco-ci-energy-estimation@v3
+        with:
+          task: get-measurement
+          label: 'setup'
+
       - name: Run tests
         run: |
           scripts/checkcode.sh .
           TERM=xterm pytest
 
+      - name: Tests measurement
+        uses: green-coding-solutions/eco-ci-energy-estimation@v3
+        with:
+          task: get-measurement
+          label: 'tests'
+      - name: Show energy results
+        uses: green-coding-solutions/eco-ci-energy-estimation@v3
+        with:
+          task: display-results
+
   build_containers:
     name: Build, test and deploy container images
     needs: perform_tests