ci: Changes from #160- Invoke the mandoc linter (#296)

* ci: Changes from #160- Invoke the mandoc linter

* Add check.sh from #160 too

* Fix mandoc

.github/workflows/qc.yaml

@@ -53,6 +53,18 @@ jobs:
         # by `cargo test`) to be _big enough_. Setting it to 8 MiB
       - run: RUST_MIN_STACK=8388608 cargo bench --workspace --exclude rosenpass-fuzzing
 
+  mandoc:
+    name: mandoc
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install mandoc
+        run: sudo apt-get install -y mandoc
+      - uses: actions/checkout@v3
+      - name: Check rosenpass.1
+        run: doc/check.sh doc/rosenpass.1
+      - name: Check rp.1
+        run: doc/check.sh doc/rp.1
+
   cargo-audit:
     runs-on: ubuntu-latest
     steps: