Purge CI cache

.github/workflows/build.yml

@@ -33,6 +33,8 @@ jobs:
           toolchain: stable
           override: true
       - uses: Swatinem/rust-cache@v1
+        with:
+          key: ubuntu-18.04
       - name: cargo build
         run: cargo build --release ${{ matrix.options }}
 
@@ -58,6 +60,8 @@ jobs:
           toolchain: stable
           override: true
       - uses: Swatinem/rust-cache@v1
+        with:
+          key: ubuntu-18.04
       - run: cargo test
 
   publish:
@@ -74,6 +78,8 @@ jobs:
           toolchain: stable
           override: true
       - uses: Swatinem/rust-cache@v1
+        with:
+          key: ubuntu-18.04
       - name: cargo login
         run: cargo login "$CARGO_TOKEN"
         env: