workflow: fetch-depth 0

apindex doesn't actually work with our workflow, as:
- GitHub actions clean clones everything, making the modified time nearly identical
- apindex doesn't read git history

So why bother cloning the whole stack, only clone the top commit.

.github/workflows/publish.yml

@@ -17,6 +17,7 @@ jobs:
         with:
           persist-credentials: false
           submodules: recursive
+          fetch-depth: 0
 
       - name: Install apindex-v2
         run: |