faster, cheaper (pick two): improve CI workflow and switch to free github runner (#5702)

Co-authored-by: Douwe Osinga <douwe@block.xyz>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.github/workflows/bundle-desktop-intel.yml

@@ -63,29 +63,10 @@ jobs:
           cd ui/desktop
           npm version ${{ inputs.version }} --no-git-tag-version --allow-same-version
 
-      - name: Cache Cargo registry
-        uses: actions/cache@2f8e54208210a422b2efd51efaa6bd6d7ca8920f # pin@v3
+      - name: Cache Rust dependencies
+        uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2
         with:
-          path: ~/.cargo/registry
-          key: ${{ runner.os }}-intel-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-intel-cargo-registry-
-
-      - name: Cache Cargo index
-        uses: actions/cache@2f8e54208210a422b2efd51efaa6bd6d7ca8920f # pin@v3
-        with:
-          path: ~/.cargo/index
-          key: ${{ runner.os }}-intel-cargo-index
-          restore-keys: |
-            ${{ runner.os }}-intel-cargo-index
-
-      - name: Cache Cargo build
-        uses: actions/cache@2f8e54208210a422b2efd51efaa6bd6d7ca8920f # pin@v3
-        with:
-          path: target
-          key: ${{ runner.os }}-intel-cargo-build-release-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-intel-cargo-build-release-
+          key: intel
 
 
       - name: Build goose-server for Intel macOS (x86_64)