ci: use ubuntu-arm on every PR/push, use macos at night

* Gives us a 10 minute CI system
* Expand test coverage to "arm on linux", which is a real use-case
* Replaces slowest runner (20 minutes) with fastest runner (5 minutes)
* Still tests with macos-arm at night
* Policeman Jenkins still tests macos many times a day (and more reliably)

Author: rmuir

.github/workflows/run-checks-all.yml

@@ -69,7 +69,7 @@ jobs:
     strategy:
       matrix:
         # Operating systems to run on.
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ ubuntu-latest, ubuntu-24.04-arm, windows-latest ]
         java: [ '25' ]
 
     runs-on: ${{ matrix.os }}
@@ -87,14 +87,6 @@ jobs:
       - name: Configure tools
         uses: ./.github/actions/prepare-for-build
 
-      - name: Speedup MacOS runner
-        if: ${{ runner.os == 'macOS' }}
-        run: |
-          mkdir /tmp/tmpfs
-          sudo mount_tmpfs -o noowners -s 1g /tmp/tmpfs
-          sudo sysctl debug.lowpri_throttle_enabled=0
-          echo "tests.workDir=/tmp/tmpfs/lucene" >> build-options.local.properties
-
       - name: Run gradle tests
         run: ./gradlew test "-Ptask.times=true" "-Pvalidation.errorprone=false"
         env:

.github/workflows/run-checks-macos.yml

@@ -0,0 +1,56 @@
+name: "Run checks on MacOS: all modules"
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '44 1 * * *'
+
+permissions: {}
+
+env:
+  DEVELOCITY_ACCESS_KEY: ${{ secrets.DEVELOCITY_ACCESS_KEY }}
+
+# We split the workflow into two parallel jobs for efficiency:
+# one is running all validation checks without tests,
+# the other runs all tests without other validation checks.
+
+jobs:
+  # This runs all tests without any other validation checks.
+  tests:
+    name: tests (JDK ${{ matrix.java }} on ${{ matrix.os }})
+    timeout-minutes: 30
+
+    strategy:
+      matrix:
+        # Operating systems to run on.
+        os: [ macos-latest ]
+        java: [ '25' ]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+
+      - name: Configure tools
+        uses: ./.github/actions/prepare-for-build
+
+      - name: Speedup MacOS runner
+        if: ${{ runner.os == 'macOS' }}
+        run: |
+          mkdir /tmp/tmpfs
+          sudo mount_tmpfs -o noowners -s 1g /tmp/tmpfs
+          sudo sysctl debug.lowpri_throttle_enabled=0
+          echo "tests.workDir=/tmp/tmpfs/lucene" >> build-options.local.properties
+
+      - name: Run gradle tests
+        run: ./gradlew test "-Ptask.times=true" "-Pvalidation.errorprone=false"
+        env:
+          # Set to the defaults to override the "CI"-based logic that would enable C2
+          # we can't afford C2 on github runners.
+          TEST_JVM_ARGS: "-XX:TieredStopAtLevel=1 -XX:+UseParallelGC -XX:ActiveProcessorCount=1"
+
+      - name: List automatically-initialized gradle.properties
+        run: cat gradle.properties