ci: downgrade bazel to 6.5.0 and add explicit installation in workflows

- Downgrade Bazel from 7.6.1 to 6.5.0 for certificate handling stability
- Add pre-build Bazel installation step with direct download (bypassing cert checks)
- Install Bazel to ~/.local/bin and update PATH for consistent CI environment
- Remove explicit PyPI repository URL (use default legacy endpoint)
- Add Python 3.12 and 3.13 classifier support

This ensures consistent Bazel availability across all CI runners (Linux/macOS)
and improves compatibility with current PyPI publishing practices.

Author: czgdp1807

.bazelrc

@@ -0,0 +1,22 @@
+# Bazel configuration for C++ standard and build options
+
+# Enforce C++17 standard for both target and host (tools) compilation
+build --cxxopt=-std=gnu++17
+build --host_cxxopt=-std=gnu++17
+build --cxxopt=-fno-strict-aliasing
+build --host_cxxopt=-fno-strict-aliasing
+
+# Disable bzlmod (new module system) to use traditional WORKSPACE
+common --noenable_bzlmod
+
+# Don't keep state after build to prevent cache issues
+common --nokeep_state_after_build
+
+# Verbose logging for CI debugging
+build --verbose_failures
+
+# macOS specific settings
+build:macos --cxxopt=-std=gnu++17
+build:macos --host_cxxopt=-std=gnu++17
+build:macos --cxxopt=-fno-strict-aliasing
+build:macos --host_cxxopt=-fno-strict-aliasing

.github/workflows/test.yml

@@ -9,7 +9,7 @@ on:
   workflow_dispatch:
 
 env:
-  USE_BAZEL_VERSION: "7.6.1"
+  USE_BAZEL_VERSION: "6.5.0"
 
 jobs:
   tests:

.github/workflows/wheels.yml

@@ -7,7 +7,7 @@ on:
     types: [published]
 
 env:
-  USE_BAZEL_VERSION: "7.6.1"
+  USE_BAZEL_VERSION: "6.5.0"
 
 
 jobs:
@@ -36,6 +36,18 @@ jobs:
       run: |
           python -m pip install --upgrade pip "setuptools<70" "build<2.0" wheel
 
+    - name: Install Bazel
+      run: |
+        mkdir -p ~/.local/bin
+        if [[ "${{ runner.os }}" == "Linux" ]]; then
+          wget --no-check-certificate -q https://github.com/bazelbuild/bazel/releases/download/${{ env.USE_BAZEL_VERSION }}/bazel-${{ env.USE_BAZEL_VERSION }}-linux-x86_64 -O ~/.local/bin/bazel
+        elif [[ "${{ runner.os }}" == "macOS" ]]; then
+          wget --no-check-certificate -q https://github.com/bazelbuild/bazel/releases/download/${{ env.USE_BAZEL_VERSION }}/bazel-${{ env.USE_BAZEL_VERSION }}-darwin-arm64 -O ~/.local/bin/bazel
+        fi
+        chmod +x ~/.local/bin/bazel
+        echo "$HOME/.local/bin" >> $GITHUB_PATH
+        bazel --version
+
     - name: Build wheels
       run: |
         python -m build --wheel --sdist
@@ -79,7 +91,6 @@ jobs:
         uses: pypa/gh-action-pypi-publish@release/v1.12
         with:
           packages-dir: wheels/
-          repository-url: https://pypi.org/legacy/
           # already checked, and the pkginfo/twine versions on this runner causes check to fail
           verify-metadata: false
           verbose: true

setup.py

@@ -124,6 +124,8 @@ def run(self):
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: 3 :: Only",
         "Topic :: Scientific/Engineering :: Artificial Intelligence",
         "Topic :: Scientific/Engineering :: Mathematics",