Fix Bazel to last non-major release before 7.0. #889

	name: "macos"

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:

	build-and-test-macos:
	name: Build and Test (macOS)
	runs-on: macos-latest
	env:
	BAZEL: bazelisk-darwin-amd64
	USE_BAZEL_VERSION: 6.4.0
	CC: gcc-9
	CXX: g++-9

	steps:
	- name: Cancel Previous Runs
	uses: styfle/[email protected]
	with:
	access_token: ${{ github.token }}

	- uses: actions/checkout@v3

	- name: Update environment variables
	run: \|
	echo "USER=${USER}" >> ${GITHUB_ENV}

	- name: Mount bazel cache
	uses: actions/cache@v3
	with:
	# See https://docs.bazel.build/versions/master/output_directories.html
	path: /private/var/tmp/_bazel_${{ env.USER }}
	key: ${{ runner.os }}-bazel-${{ hashFiles('WORKSPACE.bazel') }}
	restore-keys: ${{ runner.os }}-bazel

	- name: Install bazelisk
	run: \|
	curl -sLO "https://github.com/bazelbuild/bazelisk/releases/latest/download/$BAZEL"
	chmod +x $BAZEL

	- name: Build
	run: ./$BAZEL build -c opt --host_copt=-DGRPC_BAZEL_BUILD //mozolm/...

	- name: Test
	run: ./$BAZEL test -c opt --host_copt=-DGRPC_BAZEL_BUILD --test_output=errors //mozolm/...

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