[CI] Add label sync (JuliaLang#298)

Use existing labels & copy JS label defs

.github/labels.yml

@@ -0,0 +1,95 @@
+- name: "bug :bug:"
+  description: "Something isn't working"
+  color: "b60205"
+
+- name: "chore :wrench:"
+  description: "Meta related task such as build, test, linting, maintainers.json etc."
+  color: "000000"
+
+- name: "dependencies :arrow_up_small:"
+  description: "Pull requests that update a dependency file"
+  color: "0366d6"
+
+- name: "discussion :speech_balloon:"
+  description: ""
+  color: "fbca04"
+
+- name: "do not merge :construction:"
+  description: "Don't merge until this label is removed"
+  color: "fbca04"
+
+- name: "documentation :book:"
+  description: "Documentation changes"
+  color: "1d76db"
+
+- name: "duplicate :repeat:"
+  description: "This issue or pull request already exists"
+  color: "ffffff"
+
+- name: "enhancement :unicorn:"
+  description: "Changing current behaviour, enhancing what's already there"
+  color: "a2eeef"
+
+- name: "experimental :microscope:"
+  description: "Speculative functionality or implementation"
+  color: "b60205"
+
+- name: "first-timers only :baby:"
+  description: "This issue is specifically for those who are new contributors."
+  color: "b1db51"
+
+- name: "good first issue"
+  description: ""
+  color: "680a9b"
+
+- name: "hacktoberfest"
+  description: "Hacktoberfest issues! Everyone allowed <3"
+  color: "000000"
+
+- name: "hacktoberfest-accepted"
+  description: "Opt-in to hacktoberfest"
+  color: "4a4a4a"
+
+- name: "help wanted"
+  description: ""
+  color: "680a9b"
+
+- name: "invalid"
+  description: ""
+  color: "ffffff"
+
+- name: "new exercise :sparkles:"
+  description: ""
+  color: "1105b7"
+
+- name: "new test case :sparkles:"
+  description: ""
+  color: "1105b7"
+
+- name: "pinned :pushpin:"
+  description: ""
+  color: "fbca04"
+
+- name: "question :thinking:"
+  description: ""
+  color: "000000"
+
+- name: "security :rotating_light:"
+  description: "Security related issue or change"
+  color: "b60205"
+
+- name: "sync :arrows_counterclockwise:"
+  description: "Sync an exercise with the latest version of the problem-spec"
+  color: "1105b7"
+
+- name: "upstream :arrow_up:"
+  description: ""
+  color: "ffffff"
+
+- name: "wontfix :no_good_woman:"
+  description: "This won't be applied, fixed, worked on, continued."
+  color: "ffffff"
+
+- name: "config change :gear:"
+  description: Changes to the track or exercise configs"
+  color: "ededed"

.github/workflows/sync-labels.yml

@@ -0,0 +1,21 @@
+name: Tools
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - .github/labels.yml
+      - .github/workflows/sync-labels.yml
+  schedule:
+    - cron: 6 6 6 * *
+  workflow_dispatch:
+
+jobs:
+  sync-labels:
+    name: Sync labels
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # 2.3.4
+      - uses: micnncim/action-label-syncer@0e9c5104859d0e78219af63791636eba42382b5d # 1.2.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}