L2SS-882: Add dependencies to be able to compile pytango. Commit to specific...

L2SS-882: Add dependencies to be able to compile pytango. Commit to specific distros to get correct version of libboost-python

.gitlab-ci.yml

 default:
-  image: python:3.7 # minimum supported version
+  image: python:3.7-buster # minimum supported version
   # Make sure each step is executed in a virtual environment with some basic dependencies present
   before_script:
+    - apt-get update -y && DEBIAN_FRONTEND=noninteractive apt-get install -y libboost-python-dev libtango-dev # Needed to install pytango
     - python --version # For debugging
     - python -m pip install --upgrade pip
     - pip install --upgrade tox
@@ -47,21 +48,21 @@ run_unit_tests_py37:
     - tox -e py37
 
 run_unit_tests_py38:
-  image: python:3.8
+  image: python:3.8-buster
   stage: test
   script:
     - echo "run python3.8 unit tests /w coverage"
     - tox -e py38
 
 run_unit_tests_py39:
-  image: python:3.9
+  image: python:3.9-bullseye
   stage: test
   script:
     - echo "run python3.9 unit tests /w coverage"
     - tox -e py39
 
 run_unit_tests_py310:
-  image: python:3.10
+  image: python:3.10-bullseye
   stage: test
   script:
     - echo "run python3.10 unit tests /w coverage"