Draft: Resolve "Automate issue workflow"

Closes #25

.gitlab-ci.yml

 stages:
-  - post-merge
-  - install
   - test
+  - post-merge
+
+.npm-cache-ro:
+  cache:
+    - &npm-cache-ro
+      key:
+        files:
+          - package-lock.json
+      paths:
+        - node_modules/
+      policy: pull
 
 install-deps:
-  stage: install
+  stage: .pre
+  cache:
+    - <<: *npm-cache-ro
+      policy: pull-push
+    - key: $CI_JOB_NAME
+      paths:
+        - .npm/
   image: node
   script:
-    - npm ci
-  artifacts:
-    paths:
-      - node_modules/
-    expire_in: 10 mins
+    - npm ci --cache .npm --prefer-offline
 
 type-check:
   stage: test
   needs:
-    - job: install-deps
-      artifacts: true
+    - install-deps
+  extends: .npm-cache-ro
   image: node
   script:
     - npm run type-check
@@ -25,10 +36,25 @@ type-check:
 label-issues-merge:
   stage: post-merge
   image: curlimages/curl-base:latest
-  # rules:
-  # - if: $CI_PIPELINE_SOURCE == 'merge_request_event'
+  rules:
+    - if: $CI_PIPELINE_SOURCE == 'merge_request_event' &&
+        $CI_MERGE_REQUEST_EVENT_TYPE == 'merge_result' &&
+        $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+      allow_failure: true
   before_script:
     - apk add --no-cache jq
+  variables:
+    PROJECT_API_URL: $CI_API_V4_URL/projects/$CI_PROJECT_ID
+    CLOSED_ISSUES_API_URL: $PROJECT_API_URL/merge_requests/$CI_MERGE_REQUEST_IID/closes_issues
   script:
-    - closed_issue_ids=$(curl CI_API_V4_URL/projects/$CI_PROJECT_ID/merge_requests/$CI_MERGE_REQUEST_ID/closes_issues | jq '.[].iid')
-    - echo $closed_issue_ids
+    - CLOSED_ISSUES=$(curl --header "PRIVATE-TOKEN:$CI_PROJECT_API_TOKEN" --url $CLOSED_ISSUES_API_URL)
+    - CLOSED_ISSUE_IDS=$(echo $CLOSED_ISSUES | jq '.[].iid')
+    - |
+      for ISSUE_ID in $(eval $GET_CLOSED_ISSUE_IDS); do
+        curl --request PUT\
+          --header "PRIVATE-TOKEN:$CI_PROJECT_API_TOKEN"\
+          --url $PROJECT_API_URL/issues/$ISSUE_ID?remove_labels=Doing
+        curl --request PUT\
+          --header "PRIVATE-TOKEN:$CI_PROJECT_API_TOKEN"\
+          --url $PROJECT_API_URL/issues/$ISSUE_ID?add_labels=Done
+      done