CI: test with --all-features

This will attempt to run the Docker-based tests in GitHub Actions

.github/workflows/cosmos-tx.yml

@@ -52,5 +52,5 @@ jobs:
           profile: minimal
           toolchain: ${{ matrix.rust }}
           override: true
-      - run: cargo build --release --all-features # TODO(tarcieri): just test with --all-features
       - run: cargo test --release
+      - run: cargo test --release --all-features