Try only allowing dask 10Gib in GHA

The memory limit argument is used to tell dask how much memory it is allowed to use (and maybe to work out chuck sizes, I'm not sure).

I think GitHub actions runners have 16GB of RAM, so dask needs to use substantially less to not be killed.

The log messages from dask in the failed runs indicated it had decided to use about 14GB, so it must use a heuristic that assumes it can use most of the available ram, too much in this case.

Author: omad

tests/integration_test.sh

@@ -12,7 +12,7 @@ odc-stats --version
 echo "Test LS GeoMAD"
 
 odc-stats save-tasks --config https://raw.githubusercontent.com/GeoscienceAustralia/dea-config/709daaee176c04e33de4cc9600462717cca5b34d/dev/services/odc-stats/geomedian/ga_ls8c_nbart_gm_cyear_3.yaml --year=2015 --tiles 49:50,24:25 --overwrite ls-geomad-cyear.db
-odc-stats run  --memory-limit=15.6GiB --threads=1 --config https://raw.githubusercontent.com/GeoscienceAustralia/dea-config/709daaee176c04e33de4cc9600462717cca5b34d/dev/services/odc-stats/geomedian/ga_ls8c_nbart_gm_cyear_3.yaml --location file:///tmp --overwrite ls-geomad-cyear.db
+odc-stats run  --memory-limit=10GiB --threads=2 --config https://raw.githubusercontent.com/GeoscienceAustralia/dea-config/709daaee176c04e33de4cc9600462717cca5b34d/dev/services/odc-stats/geomedian/ga_ls8c_nbart_gm_cyear_3.yaml --location file:///tmp --overwrite ls-geomad-cyear.db
 
 ./tests/compare_data.sh /tmp/x49/y24/ ga_ls8c_nbart_gm_cyear_3_x49y24_2015--P1Y_final*.tif