Add macOS CI

Github provides macOS M1 based runners[1]. These are good enough to run
one test cluster for testing drenv itself. Unfortunately the runners are
virtualized and nested virtualization is not supported. If we try to
start a lima vm we fail with:

    Error Domain=VZErrorDomain Code=2 Description=\"Invalid virtual
    machine configuration.  Virtualization is not available on this
    hardware.\"

We can run drenv and ramenctl linters and test that do not require a
test cluster. This change add a job on macos-14[1], running the flake8,
pylint, and black. This will help developers to validate changes on
macOS without access to macOS machine.

More work is needed to filter out the test that require a test cluster.

[1] https://github.com/actions/runner-images/blob/main/images/macos/macos-14-Readme.md

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

.github/workflows/ci.yaml

@@ -27,7 +27,6 @@ env:
   IMAGE_REGISTRY: "quay.io"
   IMAGE_TAG: "ci"
   DOCKERCMD: "podman"
-  DRIVER: "container"
 defaults:
   run:
     shell: bash
@@ -109,17 +108,21 @@ jobs:
       - name: Run unit tests
         run: make test
 
-  drenv-test:
-    name: drenv tests
-    runs-on: ubuntu-22.04
+  drenv-linux:
+    name: drenv
     strategy:
       matrix:
+        os:
+          - ubuntu-22.04
         python-version:
           - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13-dev"
+    runs-on: ${{ matrix.os }}
+    env:
+      DRIVER: "container"
     steps:
       - name: Checkout source
         uses: actions/checkout@v4
@@ -178,17 +181,60 @@ jobs:
         run: make clean
         working-directory: test
 
-  ramenctl-test:
-    name: ramenctl tests
-    runs-on: ubuntu-22.04
+  drenv-macos:
+    name: drenv
+    strategy:
+      matrix:
+        os:
+          - macos-14
+        python-version:
+          - "3.12"
+    runs-on: ${{ matrix.os }}
+    env:
+      DRIVER: "vm"
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+
+      - name: Setup python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install python packages
+        run: pip install -r requirements.txt
+
+      - name: Install drenv
+        run: pip install -e test
+
+      - name: Run flake8
+        run: make flake8
+        working-directory: test
+
+      - name: Run pylint
+        run: make pylint
+        working-directory: test
+
+      - name: Run black
+        run: make black
+        working-directory: test
+
+  ramenctl:
+    name: ramenctl
     strategy:
       matrix:
+        os:
+          - ubuntu-22.04
         python-version:
           - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13-dev"
+        include:
+          - os: macos-14
+            python-version: "3.12"
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout source
         uses: actions/checkout@v4
@@ -198,7 +244,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Install tools
+      - name: Install python packages
         run: pip install -r requirements.txt
 
       - name: Install drenv