chore(ci): add unused deps and compilation checks

Author: Krapaince

.github/workflows/ci.yml

@@ -44,3 +44,11 @@ jobs:
 
       - run: mix format --check-formatted
         if: ${{ matrix.lint }}
+
+      - run: mix deps.unlock --check-unused
+        if: ${{ matrix.lint }}
+
+      - run: mix deps.compile
+
+      - run: mix compile --warnings-as-errors
+        if: ${{ matrix.lint }}