CI: Add Rocket.Chat release notification

Jenkinsfile

@@ -115,23 +115,30 @@ pipeline {
           def versionClassifier = versionClassifier()
           def version = "${versionCode} (${versionClassifier})"
           def changelog = getChangelogSinceLastNotFailedCommit()
+          def message = """
+          Une nouvelle version de Fieldnotes est disponible sur le dépôt F-Droid (staging).
+
+          Changelog:
+
+          ${changelog}
+
+          Projet: ${env.GIT_URL}
+          Branche: ${env.GIT_BRANCH}
+          Commit: ${env.GIT_COMMIT}
+          """.stripIndent()
           withCredentials([
             string(credentialsId: 'DEPLOY_NOTIFICATION_RECIPIENTS', variable: 'DEPLOY_NOTIFICATION_RECIPIENTS'),
           ]) {
             mail (
               to: "${DEPLOY_NOTIFICATION_RECIPIENTS}",
               subject: "[Pyxis/Fieldnotes][Staging] Nouvelle version: ${version}",
-              body: """
-Une nouvelle version de Fieldnotes est disponible sur le dépôt F-Droid.
-
-Changelog:
-
-${changelog}
-
-Projet: ${env.GIT_URL}
-Branche: ${env.GIT_BRANCH}
-Commit: ${env.GIT_COMMIT}
-              """.stripIndent(),
+              body: message
+            )
+            rocketSend (
+              channel: "#cadoles-pyxis",
+              emoji: ':cadoles:',
+              message: "@all\n" + message,
+              rawMessage: true
             )
           }
         }