docker: fix install location

Author: mr-c

build-schema_salad-docker.sh

@@ -2,7 +2,7 @@
 set -ex
 docker build --file=schema_salad.Dockerfile --tag=quay.io/commonwl/schema_salad .
 docker run quay.io/commonwl/schema_salad /bin/sh -c \
-	'apk add --no-cache py3-pip && pip install pytest-xdist && pytest --pyargs schema_salad -n auto'
+	'apk add --no-cache py3-pip && pip install pytest-xdist && cd /tmp && pytest --pyargs schema_salad -n auto'
 
 # version=$(git describe --tags)
 # if echo "$version" | grep -vq '\-' >& /dev/null ; then

schema_salad.Dockerfile

@@ -8,7 +8,7 @@ RUN python3 -m venv env3
 RUN source env3/bin/activate && python3 -m pip install -U pip setuptools wheel build
 RUN export SETUPTOOLS_SCM_PRETEND_VERSION=$(grep __version__ schema_salad/_version.py  | awk -F\' '{ print $2 }') ; source env3/bin/activate && SCHEMA_SALAD_USE_MYPYC=1 MYPYPATH=mypy-stubs python3 -m build --wheel --outdir=/wheels
 RUN source env3/bin/activate && python3 -m pip wheel -r requirements.txt --wheel-dir=/wheels
-RUN source env3/bin/activate && python3 -m pip install --force-reinstall --no-index --no-warn-script-location --root=/pythonroot/ /wheels/*.whl
+RUN source env3/bin/activate && python3 -m pip install --force-reinstall --no-index --no-warn-script-location --prefix=/pythonroot/usr /wheels/*.whl
 
 FROM alpine:latest as module
 LABEL maintainer peter.amstutz@curoverse.com