add clippy on build-test CI job

Author: vladimirfomene

.github/workflows/cont_integration.yml

@@ -10,7 +10,7 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
+  build-test:
 
     runs-on: ubuntu-latest
 
@@ -31,3 +31,8 @@ jobs:
     - run: cargo check --verbose --no-default-features --features=blocking
     - run: cargo check --verbose --no-default-features --features=async
     - run: cargo check --verbose --no-default-features --features=async-https
+    - name: Clippy
+      run: cargo clippy --all-targets --all-features -- -D warnings
+    - run: cargo clippy --all-targets --no-default-features --features=blocking -- -D warnings
+    - run: cargo clippy --all-targets --no-default-features --features=async -- -D warnings
+    - run: cargo clippy --all-targets --no-default-features --features=async-https -- -D warnings