ci: fix sccache in release workflow

Remove rust-cache from release workflow to fix low sccache hit rate (was 24%).
Same issue as in CI workflow - rust-cache conflicts with sccache.

Changes:
- Removed Swatinem/rust-cache from build job
- Added CARGO_INCREMENTAL=0 for better sccache performance

Expected improvements:
- sccache hit rate should increase from 24% to 40-60%
- Each target builds independently with sccache GitHub Actions cache
- Cache persists across releases (not expiring immediately)

Note: First build after this change will still be 0% (cache miss),
but subsequent releases will benefit from sccache.

Author: bug-ops

.github/workflows/release.yml

@@ -13,6 +13,7 @@ permissions:
 env:
   CARGO_TERM_COLOR: always
   RUST_BACKTRACE: 1
+  CARGO_INCREMENTAL: 0  # Disable incremental compilation for better sccache performance
 
 # Cancel previous release workflows if a new tag is pushed
 concurrency:
@@ -154,12 +155,6 @@ jobs:
         run: |
           cargo install cross --git https://github.com/cross-rs/cross
 
-      - name: Cache Cargo dependencies
-        uses: Swatinem/rust-cache@v2
-        with:
-          shared-key: release-${{ matrix.target }}
-          save-if: ${{ github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/') }}
-
       - name: Build release binary (with cross)
         if: matrix.use_cross == true
         run: cross build --release --target ${{ matrix.target }} --locked --verbose