ci: run libazureinit tests in CI (Azure#96)

Without the --workspace flag, cargo test just runs the tests for
azure-init and not the library. While we don't currently use features,
add the flag to enable all features in case we do in the future.

.github/workflows/ci.yaml

@@ -29,6 +29,6 @@ jobs:
       - name: Build azure-init
         run: cargo build --verbose
       - name: Run unit tests
-        run: cargo test --verbose
+        run: cargo test --verbose --all-features --workspace
       - name: Run clippy
         run: cargo clippy --verbose -- --deny warnings