[ci] Generate a different cache key for every job

.github/workflows/cont_integration.yml

@@ -32,6 +32,8 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+      - name: Generate cache key
+        run: echo "${{ matrix.rust }} ${{ matrix.features }}" | tee .cache_key
       - name: cache
         uses: actions/cache@v2
         with:
@@ -39,7 +41,7 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+          key: ${{ runner.os }}-cargo-${{ hashFiles('.cache_key') }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
       - name: Set default toolchain
         run: rustup default ${{ matrix.rust }}
       - name: Set profile
@@ -75,7 +77,7 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+          key: ${{ runner.os }}-cargo-${{ github.job }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
       - name: Install rustup
         run: curl https://sh.rustup.rs -sSf | sh -s -- -y
       - name: Set default toolchain
@@ -103,7 +105,7 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+          key: ${{ runner.os }}-cargo-${{ github.job }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
         # Install a recent version of clang that supports wasm32
       - run: wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - || exit 1
       - run: sudo apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main" || exit 1