Support of Python3.10

Change-Id: I1e4cea9de08806142ad552420aec1afec268d66e
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/Dockerfile b/Dockerfile
index db2155d..7784d7e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,7 +23,7 @@
 #   devops-stages/stage-build.sh
 #
 
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
 ARG APT_PROXY
 RUN if [ ! -z $APT_PROXY ] ; then \
@@ -39,8 +39,10 @@
         python3 \
         python3-all \
         python3-dev \
-        python3-setuptools
+        python3-setuptools \
+        python3-pip \
+        tox
 
-RUN python3 -m easy_install pip==22.3
-RUN pip install tox==3.24.5
+ENV LC_ALL C.UTF-8
+ENV LANG C.UTF-8