Experiment with Bazel external caching and performance flags in OSS CI.

.bazelrc

@@ -0,0 +1,5 @@
+# Default build and test options for AndroidEnv
+build --cxxopt=-std=c++17
+build --host_cxxopt=-std=c++17
+build --incompatible_enable_proto_toolchain_resolution
+build --announce_rc

.github/workflows/tests.yml

@@ -28,23 +28,24 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Setup Bazel
-        uses: bazel-contrib/setup-bazel@0.19.0
-        with:
-          bazelisk-cache: true
-          disk-cache: true
-          repository-cache: true
-
       - name: Configure MODULE.bazel python version
         run: |
           MATRIX_VER="${{ matrix.python-version }}"
           VER_UNDERSCORE="${MATRIX_VER//./_}"
           sed -i "s/python_version = \"3.11\"/python_version = \"$MATRIX_VER\"/g" MODULE.bazel
           sed -i "s/python_3_11/python_$VER_UNDERSCORE/g" MODULE.bazel
 
+      - name: Setup Bazel
+        uses: bazel-contrib/setup-bazel@0.19.0
+        with:
+          bazelisk-cache: true
+          disk-cache: true
+          repository-cache: true
+          external-cache: true
+
       - name: Run tests
         run: |
-          bazel test --cxxopt=-std=c++17 --host_cxxopt=-std=c++17 //...
+          bazel test //...
       - name: Upload test logs
         if: always()
         uses: actions/upload-artifact@v4

MODULE.bazel

@@ -6,9 +6,21 @@ module(
 # Core rules
 bazel_dep(name = "rules_python", version = "2.2.0")
 bazel_dep(name = "rules_proto_grpc_python", version = "5.8.0")
-bazel_dep(name = "protobuf", version = "27.2")
+bazel_dep(name = "protobuf", version = "31.1")
 bazel_dep(name = "rules_proto", version = "6.0.2")
 
+# Hermetic Pre-built Protoc Toolchain
+bazel_dep(name = "toolchains_protoc", version = "0.6.1")
+
+protoc = use_extension("@toolchains_protoc//protoc:extensions.bzl", "protoc")
+protoc.toolchain(
+    google_protobuf = "com_google_protobuf",
+    version = "v31.1",
+)
+use_repo(protoc, "toolchains_protoc_hub")
+
+register_toolchains("@toolchains_protoc_hub//:all")
+
 # Hermetic Python Toolchain
 python = use_extension("@rules_python//python/extensions:python.bzl", "python")
 python.toolchain(

requirements.txt

@@ -2,7 +2,7 @@ absl-py==2.1.0
 dm-env==1.6
 numpy==2.1.0
 portpicker==1.6.0
-pygame==2.6.0
+pygame>=2.6.0
 pillow>=10.4.0
 gymnasium==0.29.1
 protobuf>=6,<7