Enable aarch64 Ubuntu CI jobs

.github/workflows/build.yml

@@ -151,13 +151,23 @@ jobs:
     if: fromJSON(needs.check_source.outputs.run_tests)
     strategy:
       matrix:
+        os:
+          - windows-latest
         arch:
-        - Win32
-        - x64
-        - arm64
+          - x64
         free-threading:
-        - false
-        - true
+          - false
+          - true
+        include:
+          - os: windows-aarch64
+            arch: arm64
+            free-threading: false
+          - os: windows-aarch64
+            arch: arm64
+            free-threading: true
+          - os: windows-latest
+            arch: Win32
+            free-threading: false
     uses: ./.github/workflows/reusable-windows.yml
     with:
       arch: ${{ matrix.arch }}

.github/workflows/posix-deps-apt.sh

@@ -13,7 +13,6 @@ apt-get -yq install \
     libgdbm-dev \
     libgdbm-compat-dev \
     liblzma-dev \
-    libmpdec-dev \
     libncurses5-dev \
     libreadline6-dev \
     libsqlite3-dev \

.github/workflows/reusable-ubuntu.yml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04]
+        os: [ubuntu-22.04, ubuntu24.04-aarch64]
     env:
       FORCE_COLOR: 1
       OPENSSL_VER: 3.0.15
@@ -82,11 +82,11 @@ jobs:
     - name: Build CPython out-of-tree
       if: ${{ inputs.free-threading }}
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
-      run: make -j4
+      run: make -j
     - name: Build CPython out-of-tree (for compiler warning check)
       if: ${{ !inputs.free-threading}}
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
-      run: set -o pipefail; make -j4 --output-sync 2>&1 | tee compiler_output_ubuntu.txt
+      run: set -o pipefail; make -j --output-sync 2>&1 | tee compiler_output_ubuntu.txt
     - name: Display build info
       working-directory: ${{ env.CPYTHON_BUILDDIR }}
       run: make pythoninfo

.github/workflows/reusable-windows.yml

@@ -19,10 +19,8 @@ env:
 
 jobs:
   build:
-    name: >-
-      build${{ inputs.arch != 'arm64' && ' and test' || '' }}
-      (${{ inputs.arch }})
-    runs-on: windows-latest
+    name: 'build and test'
+    runs-on: ${{ matrix.os }}
     timeout-minutes: 60
     steps:
     - uses: actions/checkout@v4
@@ -36,10 +34,8 @@ jobs:
         -p ${{ inputs.arch }}
         ${{ fromJSON(inputs.free-threading) && '--disable-gil' || '' }}
     - name: Display build info
-      if: inputs.arch != 'arm64'
       run: .\python.bat -m test.pythoninfo
     - name: Tests
-      if: inputs.arch != 'arm64'
       run: >-
         .\PCbuild\rt.bat
         -p ${{ inputs.arch }}