docs: added Codefresh instructions (#1037)

www/content/ci.md

@@ -317,3 +317,41 @@ dockers:
   - 'gitlab.example.com:4567/Group/Project:{{ .Tag }}'
   - 'gitlab.example.com:4567/Group/Project:latest'
 ```
+
+## Codefresh
+
+Codefresh uses Docker based pipelines where all steps must be Docker containers. Using Goreleaser is very easy via the [existing Docker image](https://hub.docker.com/r/goreleaser/goreleaser/).
+
+Here is an example pipeline that builds a Go application and then uses Goreleaser.
+
+```yaml
+version: '1.0'
+stages:
+  - prepare
+  - build
+  - release
+steps:
+  main_clone:
+    title: 'Cloning main repository...'
+    type: git-clone
+    repo: '${{CF_REPO_OWNER}}/${{CF_REPO_NAME}}'
+    revision: '${{CF_REVISION}}'
+    stage: prepare
+  BuildMyApp:
+    title: Compiling go code
+    stage: build
+    image: 'golang:1.12'
+    commands:
+      - go build 
+  ReleaseMyApp:
+    title: Creating packages
+    stage: release
+    image: 'goreleaser/goreleaser'
+    commands:
+      - goreleaser --rm-dist 
+```
+
+You need to pass the variable `GITHUB_TOKEN` in the Codefresh UI that contains credentials to your Github account or load it from [shared configuration](https://codefresh.io/docs/docs/configure-ci-cd-pipeline/shared-configuration/).
+You should also restrict this pipeline to run only on tags when you add [git triggers](https://codefresh.io/docs/docs/configure-ci-cd-pipeline/triggers/git-triggers/) on it.
+
+More details can be found in the [goreleaser example page](https://codefresh.io/docs/docs/learn-by-example/golang/goreleaser/).