Try setting up GitPod (#2190)

* Try setting up GitPod

* Try pre-building nearcore in Docker image

* Remove rustup command  (nightly should already be available)

* Update location for nearcore prebuild

* Fix the way cargo is executed in Dockerfile

* Do cargo test as well when building docker image

.gitpod.Dockerfile

@@ -0,0 +1,4 @@
+FROM gitpod/workspace-full
+
+RUN git clone https://github.com/nearprotocol/nearcore.git --depth 1 /home/gitpod/nearcore
+RUN bash -cl "cd /home/gitpod/nearcore && cargo build && cargo test"

.gitpod.yml

@@ -0,0 +1,8 @@
+tasks:
+  - init: cp -R /home/gitpod/nearcore/target ./target && cargo build && cargo test 
+image:
+  file: .gitpod.Dockerfile
+github:
+  prebuilds:
+    addCheck: true
+    addComment: true