[BUG] data missing for quickstart

[wipfli]

Describe the bug

The quickstart-from-source.sh script does not download data.

To Reproduce
Steps to reproduce the behavior:

1. clone this repo
2. configure java and intellij according to contributing guidelines
3. run ./quickstart-from-source.sh
4. Error Exception in thread "main" java.lang.IllegalArgumentException: data/sources/lake_centerline.shp.zip does not exist

Expected behavior
quickstart-from-souce.sh should download the required assets.

Environment (please complete the following information):

• Hardware: dell xps 2021
• OS: ubuntu
• Java version and distribution: java 17.0.1 2021-10-19 LTS

[wipfli]

Maybe we could add instructions somewhere that one needs to download the stuff first with something like:

sudo docker run -e JAVA_TOOL_OPTIONS="-Xmx1g" -v "$(pwd)/data":/data ghcr.io/onthegomap/planetiler:latest --only-download --area=monaco

[msbarry]

Good catch! We'll add some more scripts for different run variations (docker/jar/maven) in #74 but for now I think all that might be needed is adding the --download option here