Make the dockerfile work on Openshift

For various reason, /explorer is created with Docker, and not
on podman (see containers/podman#11842)

The easiest fix is to use a existing directory (rather than wrangling
with podman/docker difference)

And the current sourcecode need to be copied, which is not
done by default as far as I know.

Dockerfile

@@ -3,7 +3,8 @@ FROM python:3.8.12-bullseye
 # include your own label. Example below.
 #LABEL James Kunstle <[email protected]>
 EXPOSE 8050
-WORKDIR /explorer
-COPY ./requirements.txt /explorer
-RUN pip3 install -r /explorer/requirements.txt
+WORKDIR /srv
+COPY requirements.txt /srv
+RUN pip3 install -r requirements.txt
+COPY . /srv
 CMD python3 index.py