Add .gitpod (thanos-io#3499)

Signed-off-by: Adam Domagalski <[email protected]>

Author: AdamDomagalsky

.gitpod.yml

@@ -0,0 +1,13 @@
+tasks:
+  - init: >
+      test -f go.mod && go get -v ./...;
+      wget https://github.com/prometheus/prometheus/releases/download/v2.22.2/prometheus-2.22.2.linux-amd64.tar.gz --directory-prefix=/tmp;
+      cd /tmp && tar xvfz prometheus-*.tar.gz && rm prometheus-*.tar.gz;
+      mv prometheus-*/prometheus /workspace/go/bin/;
+      wget https://raw.githubusercontent.com/vishnubob/wait-for-it/master/wait-for-it.sh && chmod u+x ./wait-for-it.sh && cd /workspace/thanos/scripts && mv /tmp/wait-for-it.sh .;
+      ./quickstart.sh;
+      for i in {0..2};do ./wait-for-it.sh -q localhost:909"$i" --  && echo "Prometheus instance no.$((i+1)) localhost:909$i is up"; done;
+      ./wait-for-it.sh localhost:10914 --  && echo "Thanos frontend at localhost:10914 is up";
+ports:
+  - port: 10914
+    onOpen: open-preview

CONTRIBUTING.md

@@ -84,6 +84,8 @@ component of the Thanos distributed system. We recommend:
 * Familiarizing yourself with our [coding style guidelines.](docs/contributing/coding-style-guide.md).
 * Familiarizing yourself with the [Makefile](Makefile) commands, for example `format`, `build`, `proto`, `docker` and `test`.
 `make help` will print most of available commands with details.
+* Spin up a prebuilt dev environment using Gitpod.io
+[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/thanos-io/thanos)
 
 ### Pull Request Process
 

README.md

@@ -12,6 +12,7 @@
 [![go](https://github.com/thanos-io/thanos/workflows/go/badge.svg)](https://github.com/thanos-io/thanos/actions?query=workflow%3Ago)
 [![react](https://github.com/thanos-io/thanos/workflows/react/badge.svg)](https://github.com/thanos-io/thanos/actions?query=workflow%3Areact)
 [![docs](https://github.com/thanos-io/thanos/workflows/docs/badge.svg)](https://github.com/thanos-io/thanos/actions?query=workflow%3Adocs)
+[![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/thanos-io/thanos)
 
 ## Overview