Runtime: Test Dialyzer in Rebars jobs (#4281)

The CI workflow uses ubuntu-24.04 and setup-beam action,
so it can test only Erlang/OTP 24 and higher.

To ensure Dialyzer is also ran with older Erlang versions,
let's add Dialyzer testing to the Runtime workflow,
which uses the erlang container, and that allows
to run Erlang/OTP 20 in ubuntu-24.04.

.github/workflows/runtime.yml

@@ -81,6 +81,8 @@ jobs:
 
     - run: make xref
 
+    - run: make dialyzer
+
     - name: Prepare rel (rebar2)
       if: matrix.rebar == 'rebar'
       run: |