Add Snake workshop for Brno (#761)

Author: encukou

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install poetry
-        poetry install
+        poetry install --no-root
     - name: Freeze the site
       run: |
         export NAUCSE_MAIN_REPO_URL=https://github.com/$GITHUB_REPOSITORY

courses.yml

@@ -508,3 +508,6 @@ lessons:
   url: https://github.com/mcurlej/naucse-python
   branch: compiled/main
   path: olomouc
+2025/snake-brno-zima:
+  url: https://github.com/encukou/naucse-python
+  branch: compiled/snake-2025-01