try fixing size-cmp workflow

Author: Madoshakalaka

.github/workflows/size-cmp.yml

@@ -30,13 +30,6 @@ jobs:
         uses: actions/checkout@v4
         if: ${{ matrix.target == 'pr' }}
 
-      - name: Write Optimisation Flags
-        run: |
-          echo 'build-std = ["std", "panic_abort"]' >> .cargo/config.toml
-          echo 'build-std-features = ["panic_immediate_abort"]' >> .cargo/config.toml
-          echo '[build]' >> .cargo/config.toml
-          echo 'rustflags = ["-Cpanic=abort"]' >> .cargo/config.toml
-
       - name: Setup toolchain
         uses: dtolnay/rust-toolchain@master
         with:
@@ -47,13 +40,27 @@ jobs:
       - name: Restore Rust cache for master
         uses: Swatinem/rust-cache@v2
         with:
-          shared-key: size-compare
+          key: size-compare-${{ matrix.target }}
+          cache-targets: "false"
 
       - name: Setup Trunk
         uses: jetli/trunk-action@v0.5.1
         with:
           version: "latest"
 
+      - name: Build examples tool
+        run: cargo build --release -p build-examples --bin build-examples
+
+      - name: Clean all build artifacts before applying build-std
+        run: cargo clean
+
+      - name: Write Optimisation Flags
+        run: |
+          echo 'build-std = ["std", "panic_abort"]' >> .cargo/config.toml
+          echo 'build-std-features = ["panic_immediate_abort"]' >> .cargo/config.toml
+          echo '[build]' >> .cargo/config.toml
+          echo 'rustflags = ["-Cpanic=abort"]' >> .cargo/config.toml
+
       - name: Build examples
         run: cargo run -p build-examples --bin build-examples