ci: update 7.3 to gh actions and sync with master

.github/dependabot.yml

@@ -1,8 +1,21 @@
 version: 2
 updates:
-- package-ecosystem: npm
-  directory: "/"
-  schedule:
-    interval: daily
-    time: "22:00"
-  open-pull-requests-limit: 10
+  - package-ecosystem: npm
+    directory: "/"
+    schedule:
+      interval: daily
+      time: "22:00"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: weekly
+      time: "22:00"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "chore"
+      include: "scope"

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - '8.0'
+      - '7.3'
+    tags:
+      - '**'
+  pull_request:
+    branches:
+      - 7.3
+
+jobs:
+  docs-build:
+    name: Build documentation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
+        with:
+          node-version: '22'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Build documentation
+        run: npm run antora
+

.github/workflows/lint-pr-title.yml

@@ -0,0 +1,16 @@
+name: Lint PR title
+
+on:
+  pull_request:
+    types:
+      - opened
+      - edited
+      - synchronize
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -1,5 +1,9 @@
 # Infinite Scale Documentation
 
+**IMPORTANT**
+
+Since April 2026, this repository requires [Commit Signing](https://docs.github.com/articles/about-gpg) and uses [Conventional Commits](https://www.conventionalcommits.org) for commits and the Pull Request title.
+
 **Table of Contents**
 
 * [Building the Infinite Scale Docs](#building-the-infinite-scale-docs)