CI: Install git before checkout for submodule support

The pandoc/latex container lacks git, causing checkout to fall back
to REST API which doesn't support submodules.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: terryburton

.github/workflows/ci.yml

@@ -44,14 +44,14 @@ jobs:
     container: pandoc/latex:2.9
 
     steps:
+      - name: Install dependencies
+        run: apk add --no-cache git make
+
       - name: Checkout
         uses: actions/checkout@v4
         with:
           submodules: true
 
-      - name: Install make
-        run: apk add --no-cache make
-
       - name: Build docs
         run: make -C wikidocs -f __pandoc/Makefile all