Clean cache before test and clippy

.github/workflows/test.yml

@@ -20,11 +20,15 @@ jobs:
           toolchain: ${{ matrix.rust }}
           override: true
           components: rustfmt, clippy
-      - run: sudo DEBIAN_FRONTEND=noninteractive apt-get -y install postfix
-      - run: smtp-sink 2525 1000&
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clean
+          args: -p lettre lettre_email
       - uses: actions-rs/cargo@v1
         with:
           command: check
+      - run: sudo DEBIAN_FRONTEND=noninteractive apt-get -y install postfix
+      - run: smtp-sink 2525 1000&
       - uses: actions-rs/cargo@v1
         with:
           command: test
@@ -32,6 +36,10 @@ jobs:
         with:
           command: fmt
           args: --all -- --check
+      - uses: actions-rs/cargo@v1      
+        with:
+          command: clean
+          args: -p lettre lettre_email
       - uses: actions-rs/cargo@v1
         with:
           command: clippy