[CI] skip installation step when cache hit (#1978)

* [ci] fix, showing cache hit, re-install dependencies

* [ci] fix ci workflow to check the cache-hit output and add restore-key for wider cache range

.github/actions/cache/action.yml

@@ -8,12 +8,19 @@
 
 name: Cache
 description: 'Caches cargo dependencies'
+outputs:
+  cache-hit:
+    description: "Cache Hit"
+    value: ${{ steps.cache.outputs.cache-hit }}
 runs:
   using: composite
   steps:
     - uses: actions/cache@v4
+      id: cache
       with:
         path: |
           ~/.cargo/
         key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+        restore-keys: |
+          ${{ runner.os }}-cargo-
 

.github/workflows/ci.yml

@@ -656,10 +656,11 @@ jobs:
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-      - name: Populate cache
+      - id: populate-cache
         uses: ./.github/actions/cache
 
       - name: Download dependencies
+        if: steps.populate-cache.outputs.cache-hit != 'true'
         run: |
           # Ensure all dependencies are downloaded - both for our crates and for
           # tools we use in CI. We don't care about these tools succeeding for