Pass some jenkins environment variables to the janitor worker.

This allows e.g. linking back to the jenkins result pages.

bin/janitor_worker.sh

@@ -5,6 +5,12 @@ set -e
 docker run --rm --cap-add=SYS_ADMIN --privileged \
 	--memory=20g \
 	-v /srv/janitor:/srv/janitor \
+	-e BUILD_URL="${BUILD_URL}" \
+	-e EXECUTOR_NUMBER="${EXECUTOR_NUMBER}" \
+	-e BUILD_ID="${BUILD_ID}" \
+	-e BUILD_NUMBER="${BUILD_NUMBER}" \
+	-e NODE_NAME="${NODE_NAME}" \
+	-e JENKINS_URL="${JENKINS_URL}" \
 	registry.salsa.debian.org/jelmer/janitor.debian.net/worker \
 	--listen-address=0.0.0.0 \
 	--port=8080 \