fuzzing.yml: Use prebuilt for faster setup (#10498)

Author: oech3

.github/workflows/fuzzing.yml

@@ -1,6 +1,7 @@
 name: Fuzzing
 
-# spell-checker:ignore fuzzer dtolnay Swatinem
+# spell-checker:ignore (people) dtolnay Swatinem taiki-e
+# spell-checker:ignore (misc) fuzzer
 
 on:
   pull_request:
@@ -19,16 +20,13 @@ concurrency:
 jobs:
   uufuzz-examples:
     name: Build and test uufuzz examples
+    env:
+      CARGO_INCREMENTAL: 0
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v6
       with:
         persist-credentials: false
-    - uses: dtolnay/rust-toolchain@stable
-    - uses: Swatinem/rust-cache@v2
-      with:
-        shared-key: "uufuzz-cache-key"
-        cache-directories: "fuzz/target"
     - name: Build uufuzz library
       run: |
         cd fuzz/uufuzz
@@ -59,15 +57,16 @@ jobs:
       with:
         persist-credentials: false
     - name: Install `cargo-fuzz`
-      run: |
-        echo "RUSTC_BOOTSTRAP=1" >> "${GITHUB_ENV}" # Use -Z
-        cargo install cargo-fuzz --locked
-    - uses: Swatinem/rust-cache@v2
+      uses: taiki-e/install-action@v2
       with:
-        shared-key: "cargo-fuzz-cache-key"
-        cache-directories: "fuzz/target"
+        tool: cargo-fuzz
+    - name: Emulate a nightly toolchain
+      run: |
+        echo "RUSTC_BOOTSTRAP=1" >> "${GITHUB_ENV}"
     - name: Run `cargo-fuzz build`
-      run: cargo fuzz build
+      # Force the correct target
+      # https://github.com/rust-fuzz/cargo-fuzz/issues/398
+      run: cargo fuzz build --target $(rustc --print host-tuple)
 
   fuzz-run:
     needs: fuzz-build
@@ -76,6 +75,7 @@ jobs:
     timeout-minutes: 5
     env:
       RUN_FOR: 60
+      CARGO_INCREMENTAL: 0
     strategy:
       matrix:
         test-target:
@@ -104,27 +104,22 @@ jobs:
       with:
         persist-credentials: false
     - name: Install `cargo-fuzz`
-      run: |
-        echo "RUSTC_BOOTSTRAP=1" >> "${GITHUB_ENV}" # Use nightly
-        cargo install cargo-fuzz --locked
-    - uses: Swatinem/rust-cache@v2
+      uses: taiki-e/install-action@v2
       with:
-        shared-key: "cargo-fuzz-cache-key"
-        cache-directories: "fuzz/target"
-    - name: Restore Cached Corpus
-      uses: actions/cache/restore@v5
-      with:
-        key: corpus-cache-${{ matrix.test-target.name }}
-        path: |
-          fuzz/corpus/${{ matrix.test-target.name }}
+        tool: cargo-fuzz
+    - name: Emulate a nightly toolchain
+      run: |
+        echo "RUSTC_BOOTSTRAP=1" >> "${GITHUB_ENV}"
     - name: Run ${{ matrix.test-target.name }} for XX seconds
       id: run_fuzzer
       shell: bash
       continue-on-error: ${{ !matrix.test-target.should_pass }}
       run: |
         mkdir -p fuzz/stats
         STATS_FILE="fuzz/stats/${{ matrix.test-target.name }}.txt"
-        cargo fuzz run ${{ matrix.test-target.name }} -- -max_total_time=${{ env.RUN_FOR }} -timeout=${{ env.RUN_FOR }} -detect_leaks=0 -print_final_stats=1 2>&1 | tee "$STATS_FILE"
+        # Force the correct target
+        # https://github.com/rust-fuzz/cargo-fuzz/issues/398
+        cargo fuzz run --target $(rustc --print host-tuple) ${{ matrix.test-target.name }} -- -max_total_time=${{ env.RUN_FOR }} -timeout=${{ env.RUN_FOR }} -detect_leaks=0 -print_final_stats=1 2>&1 | tee "$STATS_FILE"
 
         # Extract key stats from the output
         if grep -q "stat::number_of_executed_units" "$STATS_FILE"; then
@@ -193,12 +188,6 @@ jobs:
         fi
 
         echo "" >> $GITHUB_STEP_SUMMARY
-    - name: Save Corpus Cache
-      uses: actions/cache/save@v5
-      with:
-        key: corpus-cache-${{ matrix.test-target.name }}
-        path: |
-          fuzz/corpus/${{ matrix.test-target.name }}
     - name: Upload Stats
       uses: actions/upload-artifact@v6
       with: