feat(doc): changelog system (#6350)

This system provides rules and automatizes (Deno-typescript) the creation of a changelog file to help developers to adapt their code and know what is new with every (pre)release

.github/workflows/import_pending.yml

@@ -0,0 +1,34 @@
+name: import-pending
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  import-pending:
+    strategy:
+      fail-fast: false
+    runs-on: ubuntu-20.04
+    if: github.repository == 'azerothcore/azerothcore-wotlk'
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+      - name: Extract branch name
+        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+        id: extract_branch
+      - name: Import and commit pending sql
+        run: |
+          git config user.email "azerothcorebot@gmail.com" && git config user.name "AzerothCoreBot"
+          bash bin/acore-db-pendings
+          bash bin/acore-import-changelogs
+          git fetch --unshallow origin ${BRANCH}
+          git add -A .
+          git commit -am "chore(DB): import pending files" -m "Referenced commit(s): ${GITHUB_SHA}" || true
+        env:
+          BRANCH: ${{ steps.extract_branch.outputs.branch }}
+      - name: Push changes
+        uses: ad-m/github-push-action@fe38f0a751bf9149f0270cc1fe20bf9156854365
+        with:
+          github_token: ${{ secrets.AC_GITHUB_TOKEN }}
+          branch: ${{ steps.extract_branch.outputs.branch }}