Auto-publish release after all builds succeed

- Add publish-release job that removes draft flag once all builds complete
- publish-crates now depends on publish-release (release is public before crates.io)
- Use actions-rust-lang/setup-rust-toolchain@v1 in build-release (consistent
  with ci.yml, includes built-in caching)

Author: ilyazub

.github/workflows/release.yml

@@ -57,7 +57,9 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Install Rust toolchain
-        run: rustup target add ${{ matrix.target }}
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          target: ${{ matrix.target }}
 
       - name: Prepend Strawberry Perl to PATH (Windows)
         if: runner.os == 'Windows'
@@ -113,9 +115,19 @@ jobs:
             "${{ steps.package.outputs.archive }}" \
             "${{ steps.package.outputs.sha256 }}"
 
+  publish-release:
+    name: Publish release
+    needs: build-release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Publish release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: gh release edit "$GITHUB_REF_NAME" --draft=false --repo "$GITHUB_REPOSITORY"
+
   publish-crates:
     name: Publish to crates.io
-    needs: build-release
+    needs: publish-release
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6