docs: Adding Semaphore CI to GoReleaser documentation (#860)

* include Semaphore in CI sections

* Changed SemaphoreCI to Semaphore (#1)

* Update ci.md

* Update ci.md

* Update ci.md

* Corrected typos (#3)

* Corrected typos (#2)

www/content/ci.md

@@ -181,3 +181,88 @@ steps:
 ~_      ICAgICAgIEgwYndIaGUxR1E9PQo=
 
 ```
+
+## Semaphore
+
+In [Sempahore 2.0](https://semaphoreci.com) each project starts with the
+default pipeline specified in .semaphore/semaphore.yml.
+
+```yml
+# .semaphore/semaphore.yml.
+version: v1.0
+name: Build
+agent:
+  machine:
+    type: e1-standard-2
+    os_image: ubuntu1804
+
+blocks:
+  - name: "Test"
+    task:
+      prologue:
+        commands:
+          # set go version
+          - sem-version go 1.11
+          - "export GOPATH=~/go"
+          - "export PATH=/home/semaphore/go/bin:$PATH"
+          - checkout
+
+      jobs:
+        - name: "Lint"
+          commands:
+            - go get ./...
+            - go test ./...
+
+# On Semaphore 2.0 deployment and delivery is managed with promotions,
+# which may be automatic or manual and optionally depend on conditions.
+promotions:
+    - name: Release
+       pipeline_file: goreleaser.yml
+       auto_promote_on:
+         - result: passed
+           branch:
+             - "^refs/tags/v*"
+```
+
+Pipeline file in .semaphore/goreleaser.yml:
+
+```yml
+version: "v1.0"
+name: GoReleaser
+agent:
+  machine:
+    type: e1-standard-2
+    os_image: ubuntu1804
+blocks:
+  - name: "Release"
+    task:
+      secrets:
+        - name: goreleaser
+      prologue:
+        commands:
+          - sem-version go 1.11
+          - "export GOPATH=~/go"
+          - "export PATH=/home/semaphore/go/bin:$PATH"
+          - checkout
+      jobs:
+      - name: goreleaser
+        commands:
+          - curl -sL https://git.io/goreleaser | bash
+```
+
+The following YAML file, `createSecret.yml` creates a new secret item that is called goreleaser
+with one environment variable, named GITHUB_TOKEN:
+
+```yml
+apiVersion: v1alpha
+kind: Secret
+metadata:
+  name: goreleaser
+data:
+  env_vars:
+    - name: GITHUB_TOKEN
+      value: "4afk4388304hfhei34950dg43245"
+```
+
+Check [Managing Secrets](https://docs.semaphoreci.com/article/15-secrets) for
+more detailed documentation.