fix(linux / windows): Use GitHub mirror to download Bazel (#1055)

* fix(linux): Use github mirror for Bazel download

The default `releases.bazel.build` is offline due to a TLS certificate expiring

* fix(windows): Use github mirror for Bazel download

The default `releases.bazel.build` is offline due to a TLS certificate expiring

* fix(linux): Add missing spaces (oops)

Author: Ishirui

linux/Dockerfile

@@ -358,7 +358,11 @@ RUN ln -s /usr/local/bin/bazelisk /usr/local/bin/bazel
 # Verify Bazelisk properly bootstraps Bazel - this also preinstalls Bazel ${TEST_BAZEL_VERSION}
 ARG TEST_BAZEL_VERSION
 RUN readlink -f "$(command -v bazel)" | tee /dev/stderr | grep -Fqx /usr/local/bin/bazelisk
-RUN BAZELISK_HOME=/tmp/bazelisk USE_BAZEL_VERSION=${TEST_BAZEL_VERSION} bazel --version | tee /dev/stderr | grep -Fqx "bazel ${TEST_BAZEL_VERSION}"
+RUN BAZELISK_HOME=/tmp/bazelisk \
+USE_BAZEL_VERSION=${TEST_BAZEL_VERSION} \
+# TODO(incident-47542): Remove this once `releases.bazel.build` is back online
+BAZELISK_BASE_URL=https://github.com/bazelbuild/bazel/releases/download \
+bazel --version | tee /dev/stderr | grep -Fqx "bazel ${TEST_BAZEL_VERSION}"
 
 # Go
 COPY --from=go_builder /usr/local/go /usr/local/go

windows/helpers/phase3/install_bazelisk.ps1

@@ -34,6 +34,8 @@ try {
     $output = & {
         $env:BAZELISK_HOME = "$bazeliskHome"
         $env:USE_BAZEL_VERSION = '7.6.1'
+        # TODO(incident-47542): Remove this once `releases.bazel.build` is back online
+        $env:BAZELISK_BASE_URL = 'https://github.com/bazelbuild/bazel/releases/download'
         bazel --version
     }
     if ($output -ne 'bazel 7.6.1') {