fix: install missing system deps

Author: tsirysndr

.github/workflows/ci.yml

@@ -21,6 +21,9 @@ jobs:
           POSTGRES_DB: demo_rails5_test
       - name: check style + security
         run: |
+          fluentci run --wasm devbox setup
+          devbox init
+          devbox add ruby@$RUBY_VERSION postgresql mysql pkg-config
           fluentci run --wasm ruby bundle_exec rubocop
           fluentci run --wasm ruby bundle_exec brakeman
         env: