New alpine:latest requiere virtual env for python

Component test image is failing on docker build stage.
This is because recent alpine (latest) docker image does not
allow to use pip3 install on non-virtual environment.

So we need to adapt the CT dockerfile as well as the way
to run the component tests.

ct/Dockerfile

@@ -12,6 +12,6 @@ RUN apk update && apk add \
 COPY src /pytest
 WORKDIR /pytest
 
-RUN pip3 install -r requirements.txt
+RUN python3 -m venv /venv && source /venv/bin/activate && pip3 install -r requirements.txt
 
 CMD [ "sleep", "infinity" ]

ct/test.sh

@@ -77,7 +77,7 @@ do_test() {
   local test_pod=$1
   shift
   # shellcheck disable=SC2068
-  kubectl exec -it "${test_pod}" -c test -n "${NAMESPACE}" -- pytest $@
+  kubectl exec -it "${test_pod}" -c test -n "${NAMESPACE}" -- sh -c "source /venv/bin/activate && pytest $@"
 }
 
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