ci (spellcheck, build)

.github/workflows/ci-docs.yml

@@ -0,0 +1,42 @@
+name: CI - Docs build check
+
+on:
+  pull_request:
+  push:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Spellcheck
+        run: |
+          set -euo pipefail
+          npx --yes cspell \
+            --config tools/spellcheck/cspell.yml \
+            "docs/**/*.md" \
+            README.md
+
+      - name: Install build dependencies
+        run: |
+          set -euo pipefail
+          pip install -r mkdocs/requirements.txt
+
+      - name: MkDocs build (strict default)
+        run: |
+          set -euo pipefail
+          # Default strict on if unset (works in act/Gitea/GitHub)
+          export MKDOCS_STRICT="${MKDOCS_STRICT:-true}"
+          tools/mkdocs_build.sh --config mkdocs/mkdocs.yml