add gitlab CI config

.gitlab-ci.yml

+#
+# Before using this .gitlab-ci.yml:
+#
+# - This example uses the latest Docker image, but you might want to use the
+#   exact version to avoid any broken pipelines.
+#   All available Hugo versions are listed under https://gitlab.com/pages/hugo/container_registry.
+# - Read about the difference between hugo and hugo_extended
+#   https://gitlab.com/pages/hugo/-/blob/main/README.md#hugo-vs-hugo_extended.
+# - To change the theme, see
+#   https://gitlab.com/pages/hugo/-/blob/main/README.md#use-a-custom-theme.
+#
+image: registry.gitlab.com/pages/hugo/hugo_extended:latest
+
+variables:
+  HUGO_ENV: production
+  THEME_URL: "github.com/theNewDynamic/gohugo-theme-ananke"
+
+default:
+  before_script:
+    - apk add --no-cache go curl bash nodejs
+    - hugo mod get -u $THEME_URL
+    ## Uncomment the following if you use PostCSS. See https://gohugo.io/hugo-pipes/postcss/
+    #- npm install postcss postcss-cli autoprefixer
+
+test:
+  script:
+    - hugo
+  rules:
+    - if: $CI_COMMIT_REF_NAME != $CI_DEFAULT_BRANCH
+
+pages:
+  script:
+    - hugo
+  artifacts:
+    paths:
+      - public
+  rules:
+    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH