Github action: make corpus cache additive

The old way would just always use the cached corpus from the first run then never update the cache. If I understand this restore-keys configuration, then this should change the behavior to always update the corpus used in this latest run then try to restore from the most recent run the next time around.

.github/workflows/fuzz.yml

@@ -22,15 +22,21 @@ jobs:
           profile: minimal
           toolchain: nightly
           override: true
-    - name: Install cargo fuzz
-      run: cargo install cargo-fuzz
+    - uses: actions-rs/install@v0.1
+      name: Install cargo-fuzz
+      with:
+          crate: cargo-fuzz
+          version: latest
+          use-tool-cache: true
     - name: Build
       run: cargo build --verbose
     - name: Cache fuzzy corpus
       uses: actions/cache@v3
       with:
         path: fuzz/corpus
-        key: fuzz-corpus
+        key: fuzz-corpus-${{ github.run_id }}
+        restore-keys: |
+            fuzz-corpus-
     - name: fuzzy common
       run: cargo fuzz run common -- -max_total_time=60
     - name: fuzzy notes