chore: introduce rustdoc coverage for PRs too

Signed-off-by: R. Tyler Croy <[email protected]>

Author: rtyler

.github/workflows/docs.yml

@@ -19,6 +19,17 @@ env:
   BUILD_ARGS: ${{ (github.event_name == 'repository_dispatch' || github.event_name == 'workflow_dispatch') && 'install MATURIN_EXTRA_ARGS="--manylinux off"' || 'develop' }}
 
 jobs:
+  print_doc_coverage:
+    name: Print documentation coverage
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+      - id: coverage
+        uses: bewee/rustdoc-coverage-action@v1
+      - run: echo ${{ steps.coverage.outputs.documented }}
   markdown-link-check:
     runs-on: ubuntu-latest
     steps: