CI script improvements (llvm#1547)

* ci: update versions of external actions

Node.js 12 actions are deprecated and will eventually go away, so this
patch bumps the old actions to their latest versions that use Node.js
16.

* ci: replace deprecated action with bash commands

The llvm/actions/install-ninja action uses Node.js 12, which is
deprecated.  Since that action is not updated to work with Node.js 16,
this patch replaces that action with equivalent bash commands to install
Ninja.

* ci: use smaller ccache artifacts to reduce evictions

Over time, our ccache sizes have grown quite large (some as large as
1.3 GB), which results in us routinely exceeding GitHub's limits, thus
triggering frequent cache evictions.  As a result, cache downloads and
uploads take unnecessary long, in addition to fewer cache entries being
available.

Based on experiments on a clean cache state, it appears that we need
less than 300 MB of (compressed) ccache artifacts for each build type.
Anything larger than that will accrue changes from the past that aren't
needed.

To alleviate the cache burden, this patch sets the maximum ccache size
to be 300 MB.  This change should not affect the success or failure of
our builds.  I will monitor the build times to check whether this change
causes any performance degradation.

* ci: use consistent platform identifiers

Prior to this patch, some of our builds ran on `ubuntu-latest`, while
some others ran on `ubuntu-20.04` and others ran on `ubuntu-22.04`, with
similar situations for macOS and windows.  This patch instead sets all
Linux builds to run on `ubuntu-latest`, all macOS builds to run on
`macos-latest`, and all Windows builds to run on `windows-latest`, to
make debugging future CI failures a little easier.

.github/actions/setup-build/action.yml

@@ -14,7 +14,7 @@ runs:
 
   steps:
   - name: Set up Python
-    uses: actions/setup-python@v2
+    uses: actions/setup-python@v4
     with:
       python-version: '3.10'
 
@@ -28,12 +28,24 @@ runs:
       python -m pip install -r requirements.txt
     shell: bash
 
-  - name: Install Ninja
-    uses: llvm/actions/install-ninja@55d844821959226fab4911f96f37071c1d4c3268
+  - name: Install Ninja (Linux)
+    if: ${{ runner.os == 'Linux' }}
+    run: sudo apt-get install -y ninja-build
+    shell: bash
+
+  - name: Install Ninja (macOS)
+    if: ${{ runner.os == 'macOS' }}
+    run: brew install ninja
+    shell: bash
+
+  - name: Install Ninja (Windows)
+    if: ${{ runner.os == 'Windows' }}
+    run: pip install ninja
+    shell: bash
 
   - name: Ccache for C++ compilation
     uses: hendrikmuhs/ccache-action@v1.2
     with:
       key: ${{ runner.os }}-torch_mlir_build_assets-${{ inputs.cache-suffix }}
-      max-size: 2G
+      max-size: 300M
       verbose: 2

.github/workflows/bazelBuildAndTest.yml

@@ -17,7 +17,7 @@ concurrency:
 jobs:
   ubuntu-build:
     name: ubuntu-x86_64
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
 
     steps:
     - name: Checkout torch-mlir

.github/workflows/buildAndTest.yml

@@ -43,16 +43,16 @@ jobs:
         include:
           # Specify OS versions
           - os-arch: ubuntu-x86_64
-            os: ubuntu-22.04
+            os: ubuntu-latest
           - os-arch: macos-arm64
-            os: macos-12
+            os: macos-latest
           - os-arch: windows-x86_64
             os: windows-latest
     runs-on: ${{ matrix.os }}
 
     steps:
     - name: Checkout torch-mlir
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         submodules: 'true'
 

.github/workflows/buildRelease.yml

@@ -54,7 +54,7 @@ jobs:
 
   build_macos:
     name: MacOS Build
-    runs-on: macos-12
+    runs-on: macos-latest
     steps:
     - name: Get torch-mlir
       uses: actions/checkout@v2

.github/workflows/gh-pages-releases.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   scrape_and_publish_releases:
     name: "Scrape and publish releases"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     # Don't run this in everyone's forks.
     if: github.repository == 'llvm/torch-mlir'

.github/workflows/releaseSnapshotPackage.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   release_snapshot_package:
     name: "Tag snapshot release"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     # Don't run this in everyone's forks.
     if: github.repository == 'llvm/torch-mlir'
     steps: