Add .gitpod.yml, fix casing of keys in spago.yml

Author: ad-si

.gitpod.yml

@@ -0,0 +1,5 @@
+tasks:
+  - before: >-
+      curl -fsSL https://bun.sh/install | bash
+      && source /home/gitpod/.bashrc
+    init: make build

spago.yaml

@@ -43,9 +43,9 @@ package:
     dependencies:
       - spec
 workspace:
-  package_set:
+  packageSet:
     registry: 47.12.0
-  extra_packages:
+  extraPackages:
     format:
       git: https://github.com/feramhq/purescript-format
       ref: 3b0fc6c74f439fc3ad7fc7c88fc6f73b083f82e2