Add .gitlab-ci.yml and test Ruby app

.gitlab-ci.yml

@@ -0,0 +1,47 @@
+include:
+  - component: gitlab.com/$CI_PROJECT_PATH@$CI_COMMIT_SHA
+
+stages: [test, release]
+
+# ensure-jobs-added:
+#   image: badouralix/curl-jq
+#   script:
+#     - |
+#       route="https://gitlab.com/api/v4/projects/$CI_PROJECT_ID/pipelines/$CI_PIPELINE_ID/jobs"
+#       count=`curl --silent --header "PRIVATE-TOKEN: $API_TOKEN" $route | jq 'map(select(.name | contains("component-job-"))) | length'`
+#       if [ "$count" != "2" ]; then
+#         exit 1
+#       fi
+
+# Ensure that a project description exists, because it will be important to display
+# the resource in the catalog.
+check-description:
+  image: badouralix/curl-jq
+  script:
+    - |
+      route="https://gitlab.com/api/v4/projects/$CI_PROJECT_ID"
+      desc=`curl --silent $route | jq '.description'`
+      if [ "$desc" = "null" ]; then
+        echo "Description not set. Please set a projet description"
+        exit 1
+      else
+        echo "Description set"
+      fi
+
+# Ensure that a `README.md` exists in the root directory as it represents the
+# documentation for the whole components repository.
+check-readme:
+  image: busybox
+  script: ls README.md || (echo "Please add a README.md file" && exit 1)
+
+# If we are tagging a release with a specific convention ("v" + number) and all
+# previous checks succeeded, we proceed with creating a release automatically.
+create-release:
+  stage: release
+  image: registry.gitlab.com/gitlab-org/release-cli:latest
+  rules:
+    - if: $CI_COMMIT_TAG =~ /\d+/
+  script: echo "Creating release $CI_COMMIT_TAG"
+  release:
+    tag_name: $CI_COMMIT_TAG
+    description: "Release $CI_COMMIT_TAG of components repository $CI_PROJECT_PATH"