Switch to read-only container filesystem to avoid *.pyc getting created with busted permissions.

scripts/run-full-dev-tests

@@ -10,4 +10,5 @@
 
 set -e
 
-docker-compose --file tests/end-to-end/docker-compose.yaml up --abort-on-container-exit
+docker-compose --file tests/end-to-end/docker-compose.yaml up --force-recreate \
+    --abort-on-container-exit

scripts/run-full-tests

@@ -11,7 +11,8 @@
 set -e
 
 python -m pip install --upgrade pip==19.3.1
-pip install tox==3.14.0
-tox
+pip install tox==3.14.1
+export COVERAGE_FILE=/tmp/.coverage
+tox --workdir /tmp/.tox
 apk add --no-cache borgbackup postgresql-client mariadb-client
-tox --workdir /tmp -e end-to-end
+tox --workdir /tmp/.tox -e end-to-end