Add workflow to test build on CI

.builders/build.py

@@ -93,7 +93,7 @@ def build_macos():
 
         env = {
             **os.environ,
-            'DD_PREFIX_CACHE': args.cache_dir,
+            'DD_PREFIX_CACHE': args.cache_dir or '',
             'DD_MOUNT_DIR': mount_dir,
         }
         check_process(

.github/workflows/build-deps-macos.yml

@@ -0,0 +1,38 @@
+# Workflow for dev / testing purposes only, to be migrated to a common workflow alongside
+# the rest of the deps build
+
+name: Build dependencies for mac OS
+
+on:
+  pull_request
+
+jobs:
+  build-deps-macos:
+    name: "Build wheels for integration dependencies for mac OS"
+    runs-on: macos-13
+    steps:
+      - name: "Install Python(s)"
+        env:
+          # Despite the name, this is built for the macOS 11 SDK on arm64 and 10.9+ on intel
+          PYTHON3_DOWNLOAD_URL: "https://www.python.org/ftp/python/3.11.5/python-3.11.5-macos11.pkg"
+          PYTHON2_DOWNLOAD_URL: "https://www.python.org/ftp/python/2.7.18/python-2.7.18-macosx10.9.pkg"
+        run: |
+          curl "$PYTHON3_DOWNLOAD_URL" -o python3.pkg
+          sudo installer -pkg python3.pkg -target /
+
+          curl "$PYTHON2_DOWNLOAD_URL" -o python2.pkg
+          sudo installer -pkg python2.pkg -target /
+      - name: "Remove preinstalled environment"
+        run: |
+          # We do this to avoid depending or shipping stuff that comes in the runner through brew
+          # to better control what might get shipped in the wheels via `delocate`
+          brew remove --force --ignore-dependencies $(brew list --formula)
+      - uses: actions/checkout@v4
+      - name: "Run the build"
+        env:
+          DD_PYTHON3: "/Library/Frameworks/Python.framework/Versions/3.11/bin/python3"
+          DD_PYTHON2: "/Library/Frameworks/Python.framework/Versions/2.7/bin/python"
+        run: |
+          ${DD_PYTHON3} -m pip install packaging
+          cache_dir=$(mktemp -d -t 'cached.prefix')
+          ${DD_PYTHON3} .builders/build.py --python 3 --cache-dir "${cache_dir}"  out_py3