Ensure erlfmt compliance in CI
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d575464..633dd35 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,6 +28,8 @@
         with:
           otp-version: '24'
           rebar3-version: '3.17'
+      - name: Enforce coding style
+        run: rebar3 fmt --check
       - name: Compile
         run: rebar3 compile
       - name: EUnit tests