Cross-compile darwin-x64 from the arm64 macOS runner

Free-tier GitHub runners no longer offer Intel macOS (macos-13 was
retired). Since macos-latest is now arm64, cross-compile the x64 native
addon from there using --arch x86_64, mirroring the old approach but in
the opposite direction.

PR tests only run on native architectures (you can't execute a
cross-compiled binary), so macos-13 is dropped from the test matrices.
The darwin-x64 build is validated by the release pipeline's
verify-prebuilds check.

Author: oetr

.github/workflows/release.yaml

@@ -13,12 +13,12 @@ jobs:
       contents: read
     strategy:
       matrix:
-        os:
-          - ubuntu-latest
-          - ubuntu-24.04-arm
-          - macos-13 # x64
-          - macos-latest # arm64
-          - windows-latest
+        os: [ubuntu-latest, ubuntu-24.04-arm, macos-latest, windows-latest]
+        arch: [""]
+        include:
+          # macos-latest is arm64; cross-compile for x64 too
+          - os: macos-latest
+            arch: "--arch x86_64"
     runs-on: ${{ matrix.os }}
     steps:
       - name: checkout
@@ -35,12 +35,12 @@ jobs:
         run: npm ci
       - name: build
         run: |
-          npm run prebuild --workspace=@jazzer.js/fuzzer
-          npm run build --workspace=@jazzer.js/fuzzer
+          npm run prebuild --workspace=@jazzer.js/fuzzer -- ${{ matrix.arch }}
+          npm run build --workspace=@jazzer.js/fuzzer -- ${{ matrix.arch }}
       - name: upload
         uses: actions/upload-artifact@v7
         with:
-          name: native-addon-${{ matrix.os }}
+          name: native-addon-${{ matrix.os }}${{ matrix.arch && '-x64' || '' }}
           path: packages/fuzzer/prebuilds
           if-no-files-found: error
 

.github/workflows/run-all-tests-pr.yaml

@@ -42,14 +42,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os:
-          [
-            windows-latest,
-            ubuntu-latest,
-            ubuntu-24.04-arm,
-            macos-13,
-            macos-latest,
-          ]
+        os: [windows-latest, ubuntu-latest, ubuntu-24.04-arm, macos-latest]
         node: [20]
         include:
           # Node 14 runtime compatibility is covered by end-to-end tests.
@@ -92,14 +85,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os:
-          [
-            ubuntu-latest,
-            ubuntu-24.04-arm,
-            macos-13,
-            macos-latest,
-            windows-latest,
-          ]
+        os: [ubuntu-latest, ubuntu-24.04-arm, macos-latest, windows-latest]
     steps:
       - name: checkout
         uses: actions/checkout@v6
@@ -123,16 +109,12 @@ jobs:
       # all in one job to avoid rebuilding
       # Node 14 only has binaries for x64 runners
       - name: "node 14"
-        if: >-
-          matrix.os == 'ubuntu-latest' || matrix.os == 'macos-13' || matrix.os
-          == 'windows-latest'
+        if: matrix.os == 'ubuntu-latest' || matrix.os == 'windows-latest'
         uses: actions/setup-node@v6
         with:
           node-version: 14
       - name: run tests (node 14)
-        if: >-
-          matrix.os == 'ubuntu-latest' || matrix.os == 'macos-13' || matrix.os
-          == 'windows-latest'
+        if: matrix.os == 'ubuntu-latest' || matrix.os == 'windows-latest'
         run: cd end-to-end && npx jest
         shell: bash