chore(ci): run separate tests for each service in isolation

Author: dtantsur

.github/workflows/main.yml

@@ -13,6 +13,13 @@ jobs:
           - ""
           - "--no-default-features"
           - "--no-default-features --features rustls"
+          - "--no-default-features --features baremetal"
+          - "--no-default-features --features block-storage"
+          - "--no-default-features --features compute"
+          - "--no-default-features --features identity"
+          - "--no-default-features --features image"
+          - "--no-default-features --features network"
+          - "--no-default-features --features object-storage"
     steps:
     - uses: actions/checkout@master
     - name: Install Rust