ci: reuse rust-cache between different jobs on the same platform, remove cache from lint

Author: Firestar99

.github/workflows/ci.yaml

@@ -43,9 +43,8 @@ jobs:
         run: echo "TARGET=$(rustc --print host-tuple)" >> "$GITHUB_ENV"
       - uses: Swatinem/rust-cache@v2
         with:
-          workspaces: |
-            .
-            tests/difftests/tests
+          add-job-id-key: "false"
+          shared-key: "base"
       # Fetch dependencies in a separate step to clearly show how long each part
       # of the testing takes
       - name: cargo fetch --locked
@@ -101,9 +100,8 @@ jobs:
         run: cargo version
       - uses: Swatinem/rust-cache@v2
         with:
-          workspaces: |
-            .
-            tests/difftests/tests
+          add-job-id-key: "false"
+          shared-key: "android"
       - name: cargo fetch --locked
         run: cargo fetch --locked --target ${{ matrix.target }}
 
@@ -150,9 +148,9 @@ jobs:
         run: echo "TARGET=$(rustc --print host-tuple)" >> "$GITHUB_ENV"
       - uses: Swatinem/rust-cache@v2
         with:
-          workspaces: |
-            .
-            tests/difftests/tests
+          add-job-id-key: "false"
+          shared-key: "base"
+          save-if: "false"
       - name: cargo fetch --locked
         run: cargo fetch --locked --target $TARGET
       - name: compiletest
@@ -190,9 +188,14 @@ jobs:
         run: echo "TARGET=$(rustc --print host-tuple)" >> "$GITHUB_ENV"
       - uses: Swatinem/rust-cache@v2
         with:
-          workspaces: |
-            .
-            tests/difftests/tests
+          add-job-id-key: "false"
+          shared-key: "base"
+          save-if: "false"
+      - uses: Swatinem/rust-cache@v2
+        with:
+          add-job-id-key: "false"
+          shared-key: "difftest"
+          workspaces: "tests/difftests/tests"
       - name: cargo fetch --locked
         run: cargo fetch --locked --target $TARGET
       - name: cargo fetch --locked difftests
@@ -240,11 +243,6 @@ jobs:
       # cargo version is a random command that forces the installation of rust-toolchain
       - name: install rust-toolchain
         run: cargo version
-      - uses: Swatinem/rust-cache@v2
-        with:
-          workspaces: |
-            .
-            tests/difftests/tests
       - name: Install rustup components
         run: rustup component add rustfmt clippy
       - name: cargo fetch --locked