Add CodeShip steps

docs/modules/continuous-integration/nav.adoc

@@ -8,3 +8,4 @@
 ** xref:drone.adoc[]
 ** xref:buildkite.adoc[]
 ** xref:teamcity.adoc[]
+** xref:codeship.adoc[]

docs/modules/continuous-integration/pages/codeship.adoc

@@ -0,0 +1,35 @@
+= CodeShip
+
+JReleaser can be run as part of a link:https://app.codeship.com[CodeShip] pipeline.
+
+NOTE: If you're already building with either Maven or Gradle then you might use the
+xref:tools:jreleaser-maven.adoc[] or the xref:tools:jreleaser-gradle.adoc[] instead.
+
+Add the following to the Deploy tab as a "custom script"
+
+[source,shell]
+----
+# Configure Java 11 if the previous steps used an older version of Java
+jdk_switcher home openjdk11
+jdk_switcher use openjdk11
+
+#Get the jreleaser downloader
+curl -sL https://git.io/get-jreleaser > get_jreleaser.java
+
+# Download JReleaser with version = <version>
+# Change <version> to a tagged JReleaser release
+# or leave it out to pull `latest`.
+
+java get_jreleaser.java <version>
+
+# Let's check we've got the right version
+java -jar jreleaser-cli.jar --version
+
+# Execute a JReleaser command such as 'full-release'
+java -jar jreleaser-cli.jar full-release
+----
+
+TIP: You may use `latest` to pull the latest stable release or `early-access` to pull the latest snapshot.
+
+NOTE: Use the Environment tab to configure environment variables such as `JRELEASER_GITHUB_TOKEN` and any other secrets
+required by the build.

docs/modules/continuous-integration/pages/index.adoc

@@ -12,3 +12,4 @@ in the future:
 * xref:drone.adoc[]
 * xref:buildkite.adoc[]
 * xref:teamcity.adoc[]
+* xref:codeship.adoc[]