brats: increase disk size

brats on the newly introduced Python 3.11 line are failing during
app start time with "no disk space" error.

[CELL/0] OUT Downloading droplet...
[CELL/0] ERR Copying droplet into the container failed: stream-in: nstar: error streaming in: exit status 2. Output: tar:
./deps/0/python/lib/python3.11/site-packages/setuptools/_vendor/pyparsing/__pycache__/util.cpython-311.pyc:
Cannot open: No space left on device
[CELL/0] ERR tar: ./deps/0/python/lib/python3.11/site-packages/setuptools/_vendor/pyparsing/__pycache__/core.cpython-311.pyc: Cannot open: No space left on device
[CELL/0] ERR tar: ./deps/0/python/lib/python3.11/site-packages/setuptools/_vendor/pyparsing/__pycache__/__init__.cpython-311.pyc: Cannot open: No space left on device
[CELL/0] ERR tar: ./deps/0/python/lib/python3.11/site-packages/setuptools/_vendor/pyparsing/common.py: Cannot open: No space left on device
[CELL/0] ERR tar: ./deps/0/python/lib/python3.11/site-packages/setuptools/_vendor/pyparsing/helpers.py: Cannot open: No space left on device
[CELL/0] ERR tar: ./deps/0/python/lib/python3.11/site-packages/setuptools/_vendor/pyparsing/exceptions.py: Cannot open: No space left on device
[CELL/0] OUT Cell 3285ddf7-a17d-4e7f-9501-b983c03b2737 stopping instance ab52cba8-e99a-4147-5fae-ea43
[CELL/0] OUT Cell 3285ddf7-a17d-4e7f-9501-b983c03b2737 destroying container for instance ab52cba8-e99a-4147-5fae-ea43
[API/1] OUT Process has crashed with type: "web"

Author: Arjun Sreedharan

src/python/brats/brats_suite_test.go

@@ -23,7 +23,7 @@ var _ = func() bool {
 
 func init() {
 	flag.StringVar(&cutlass.DefaultMemory, "memory", "128M", "default memory for pushed apps")
-	flag.StringVar(&cutlass.DefaultDisk, "disk", "256M", "default disk for pushed apps")
+	flag.StringVar(&cutlass.DefaultDisk, "disk", "512M", "default disk for pushed apps")
 	flag.Parse()
 }