Fix Ubuntu/Python upgrade

.prospector.yaml

@@ -8,6 +8,7 @@ doc-warnings: false
 
 ignore-patterns:
   - ^tilecloud/scripts/tc_.*.py
+  - ^examples/.*.py
 
 pylint:
   disable:

Dockerfile

@@ -6,7 +6,10 @@ RUN --mount=type=cache,target=/var/lib/apt/lists \
     --mount=type=cache,target=/var/cache,sharing=locked \
     --mount=type=cache,target=/root/.cache \
     apt-get update \
-    && apt-get install --yes --no-install-recommends python3-pip python3-dev libpq-dev make libcairo2 libcairo2-dev gcc
+    && apt-get install --yes --no-install-recommends python3-pip python3-dev python3-venv libpq-dev make libcairo2 libcairo2-dev gcc \
+    && python3 -m venv /venv
+
+ENV PATH=/venv/bin:$PATH
 
 # Used to convert the locked packages by poetry to pip requirements format
 # We don't directly use `poetry install` because it force to use a virtual environment.