Bazel mirrors (#7385)

* Switch to mirrors.bazel.build where possible

* Switch from .zip to .tar.gz for smaller downloads (it's also the default download on UNIX)

* Use direct GitHub URLs in Bazel files for clarity

* Don't pass patches to local_repository

* Remove github_repository()

* Switch to GitHub actions/checkout@v2 which is faster

* Use faster extraction method for LLVm on Windows

* Move LLVM_VERSION_WINDOWS to the shell script since it's not a CI-specific value

* Change GITHUB_TOKEN to GITHUB

* Don't show timestamps for GitHub Actions

* Factor out some options from GitHub Actions

* Tell Bazel to stay on the same volume in GitHun Actions

* Display progress output when downloading toolchains

Co-authored-by: GitHub Web Flow <noreply@github.com>

.github/workflows/main.yml

@@ -1,7 +1,6 @@
 name: CI
 
 env:
-  LLVM_VERSION_WINDOWS: 9.0.0
   DEBIAN_FRONTEND: noninteractive
 
 on: [push, pull_request]
@@ -22,7 +21,7 @@ jobs:
             compiler: clang
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
       with:
         fetch-depth: 1
     - name: Setup Bazel
@@ -47,10 +46,6 @@ jobs:
           --compilation_mode=fastbuild \
           --config=iwyu \
           --keep_going \
-          --show_progress_rate_limit=5 \
-          --show_task_finish \
-          --show_timestamps \
-          --verbose_failures \
           "//:*"
   build:
     name: ${{ matrix.name }}
@@ -69,9 +64,7 @@ jobs:
             compiler: clang-cl
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v1
-      with:
-        fetch-depth: 1
+      uses: actions/checkout@v2
     - name: Setup Bazel
       shell: bash
       env:
@@ -95,8 +88,4 @@ jobs:
         . ./ci/travis/build-helper.sh prep_build_env
         bazel --batch build \
           --keep_going \
-          --show_progress_rate_limit=5 \
-          --show_task_finish \
-          --show_timestamps \
-          --verbose_failures \
           "//:ray_pkg"  # TODO(mehrdadn): Should be "//:*", but we get a linking error with _streaming.so