Add .gitlab-ci.yml CI file.

.gitlab-ci.yml

+default:
+  image: node:lts
+
+update_data:
+  before_script:
+    - cd ../
+    - rm -Rf okpi/
+    - git clone https://git.en-root.org/indy.cat/okpi.git
+    - cd okpi/packages/core/
+    - yarn install
+    - yarn build
+    - cd ../client/
+    - yarn install
+    - yarn build
+    - cd ../../../
+    - cd $CI_PROJECT_NAME
+    - yarn install
+    - cp example.env .env
+  script:
+    - yarn babel-node --extensions ".ts" src/scripts/covid19_mobility_to_okpi.ts
+    - yarn babel-node --extensions ".ts" src/scripts/extract_france_from_okpi_covid19_mobility.ts