Fix Jenkins oldev build (#10129)

Jenkins rebuilds the oldev image when pip dependencies change, so
it needs to be able to set the nexus URL for package repos in the
build.

Author: cdrini

docker/Dockerfile.oldev

@@ -1,4 +1,11 @@
 FROM openlibrary/olbase:latest
+
+# Allow for nexus overrides (used in testing/staging builds)
+ARG NPM_CONFIG_REGISTRY
+ARG PIP_INDEX_URL
+ARG PIP_TRUSTED_HOST
+ARG HTTPS_PROXY
+
 WORKDIR /openlibrary
 
 COPY --chown=openlibrary:openlibrary requirements*.txt ./