fix: use Rust toolchain + cached tree-sitter in publish workflow

Replace Nix with direct Rust toolchain setup and cached tree-sitter
CLI to avoid the ~5min Nix overhead. Uses Swatinem/rust-cache for
fast subsequent runs.

Author: psteinroe

.github/workflows/publish.yml

@@ -103,11 +103,21 @@ jobs:
       - name: Install dependencies
         run: bun install
 
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@main
+      - name: Install Rust toolchain
+        uses: actions-rust-lang/setup-rust-toolchain@v1
 
-      - name: Setup Magic Nix Cache
-        uses: DeterminateSystems/magic-nix-cache-action@main
+      - uses: Swatinem/rust-cache@v2
+
+      - uses: actions/cache@v5
+        with:
+          path: |
+            ~/.cargo/bin/tree-sitter
+            target/**/build/pgls_treesitter_grammar-*/out/generated
+          key: ${{ runner.os }}-tree-sitter-${{ hashFiles('.tree-sitter-cli-version', 'crates/pgls_treesitter_grammar/grammar.js', 'crates/pgls_treesitter_grammar/tree-sitter.json', 'rust-toolchain.toml', 'Cargo.lock') }}
+
+      - name: Setup tree-sitter
+        run: command -v tree-sitter || cargo install tree-sitter-cli --version "$(cat .tree-sitter-cli-version)" --locked
+        shell: bash
 
       - name: Generate Packages (deprecated)
         id: generate-packages-deprecated
@@ -126,7 +136,8 @@ jobs:
           PRERELEASE: ${{ github.event_name == 'workflow_dispatch' && needs.validate_tag.outputs.is-prerelease || github.event.release.prerelease }}
 
       - name: Build WASM TS
-        run: nix develop --command bash -c "cd packages/@postgres-language-server/wasm && bun run build:ts"
+        run: bun run build:ts
+        working-directory: packages/@postgres-language-server/wasm
 
       - name: Publish npm packages as nightly (deprecated)
         if: (github.event_name == 'workflow_dispatch' && needs.validate_tag.outputs.is-prerelease == 'true') || (github.event_name == 'release' && github.event.release.prerelease)