Galaxy: Fix missing env var in final image
Galaxy: Fix missing env var in final image

This resulted in a

> /usr/bin/start.sh: line 23: ["$GALAXY_CONFIG_TOOL_DATA_PATH"]="$EXPORT_DIR/$GALAXY_CONFIG_TOOL_DATA_PATH": bad array subscript

as `GALAXY_CONFIG_TOOL_DATA_PATH` was
not set in the final image.

bgruening/docker-galaxy-stable,bgruening/docker-galaxy-stable,chambm/docker-galaxy-stable,chambm/docker-galaxy-stable,bgruening/docker-galaxy-stable,chambm/docker-galaxy-stable