CI - Install python 3.8 on bionic

.github/workflows/test.yml

@@ -178,7 +178,7 @@ jobs:
             apt-get -q update
             apt-get -q -y install dpkg-dev debhelper dh-virtualenv git python3 python3-venv python3-dev libffi-dev libxml2-dev libxslt1-dev libgdal-dev software-properties-common
             add-apt-repository --yes ppa:deadsnakes/ppa
-            apt install python3.8
+            apt-get -q -y install python3.8 python3.8-venv python3.8-dev
         - name: Building package debian 18.04
           run: |
             dpkg-buildpackage -uc -us -b
@@ -325,6 +325,8 @@ jobs:
           echo "deb [arch=amd64] https://packages.geotrek.fr/ubuntu $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/geotrek.list
           wget -O- "https://packages.geotrek.fr/geotrek.gpg.key" | sudo apt-key add -
           sudo apt-get -q update
+          sudo add-apt-repository --yes ppa:deadsnakes/ppa
+          sudo apt-get -q -y install python3.8 python3.8-venv python3.8-dev
           echo "geotrek-admin geotrek-admin/LANGUAGES string en fr" >> .debian_settings
           echo "geotrek-admin geotrek-admin/POSTGRES_USER string $POSTGRES_USER" >> .debian_settings
           echo "geotrek-admin geotrek-admin/POSTGRES_DB string $POSTGRES_DB" >> .debian_settings

debian/control

@@ -7,9 +7,9 @@ Build-Depends:
  debhelper (>= 9),
  dh-virtualenv (>= 1.0),
  git,
- python3 (>= 3.6),
- python3-venv (>= 3.6),
- python3-dev (>= 3.6),
+ python3.8 (>= 3.8),
+ python3.8-venv (>= 3.8),
+ python3.8-dev (>= 3.8),
  libgdal-dev (>= 2.2),
  libffi-dev (>= 3),
  libxml2-dev (>= 2.9.2),

debian/rules

@@ -7,7 +7,7 @@ export DH_VIRTUALENV_INSTALL_ROOT=/opt
 
 override_dh_virtualenv:
 	dh_virtualenv \
-	--python /usr/bin/python3 \
+	--python /usr/bin/python3.8 \
 	--upgrade-pip \
 	--builtin-venv \
 	--extra-pip-arg --no-cache-dir \