ci: add Discord notification for successful builds

This way teams can track what deployments happen when.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

ci/Jenkinsfile.docker

@@ -60,6 +60,27 @@ pipeline {
     }
   }
   post {
+    success { script {
+      withCredentials([
+        string(
+          credentialsId: 'discord-waku-deployments-webhook',
+          variable: 'DISCORD_WEBHOOK'
+        ),
+      ]) {
+        discordSend(
+          title: "${env.JOB_NAME}#${env.BUILD_NUMBER}",
+          description: """
+            Go-Waku deployment successful!
+            Image: [`${IMAGE_NAME}:${IMAGE_TAG}`](https://hub.docker.com/r/${IMAGE_NAME}/tags?page=1&name=${IMAGE_TAG})
+            Branch: [`${GIT_BRANCH.minus("origin/")}`](https://github.com/status-im/nwaku/commits/${GIT_BRANCH.minus("origin/")})
+            Commit: [`${GIT_COMMIT.take(8)}`](https://github.com/status-im/nwaku/commit/${GIT_COMMIT.take(8)})
+          """,
+          link: env.BUILD_URL,
+          result: currentBuild.currentResult,
+          webhookURL: env.DISCORD_WEBHOOK
+        )
+      }
+    } }
     always { cleanWs() }
   }
 }