Run unit tests on macOS in CI

Combine the linux and windows unit test jobs into one matrix job and add
a new matrix entry for macOS.

Signed-off-by: Tom Wieczorek <[email protected]>

.github/workflows/go.yml

@@ -116,90 +116,73 @@ jobs:
           name: spdx.json
           path: sbom/spdx.json
 
-
-  unittests-k0s-linux-amd64:
-    name: "Unit tests :: linux-amd64"
-    runs-on: ubuntu-22.04
-
-    steps:
-      - name: Check out code into the Go module directory
-        uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-
-      - name: Cache GOCACHE
-        uses: actions/cache@v4
-        with:
-          key: unittests-k0s-linux-amd64-gocache-${{ github.ref_name }}-${{ github.sha }}
-          restore-keys: |
-            unittests-k0s-linux-amd64-gocache-${{ github.ref_name }}-
-            build-k0s-linux-amd64-gocache-${{ github.ref_name }}-
-          path: |
-            build/cache/go/build
-
-      - name: Cache GOMODCACHE
-        uses: actions/cache@v4
-        with:
-          key: unittests-k0s-linux-amd64-gomodcache-${{ hashFiles('go.sum') }}
-          restore-keys: |
-            build-k0s-linux-amd64-gomodcache-${{ hashFiles('go.sum') }}
-          path: |
-            build/cache/go/mod
-
-      - name: Run unit tests
-        env:
-          EMBEDDED_BINS_BUILDMODE: none
-        run: make check-unit
-
-  unittests-k0s-windows-amd64:
-    name: "Unit tests :: windows-amd64"
-    runs-on: windows-2022
+  unittests-k0s:
+    strategy:
+      matrix:
+        include:
+          - name: linux-amd64
+            runs-on: ubuntu-22.04
+          - name: windows-amd64
+            runs-on: windows-2022
+            target-os: windows
+          - name: macos-arm64
+            runs-on: macos-15
+            target-os: darwin
+
+    name: "Unit tests :: ${{ matrix.name }}"
+    runs-on: "${{ matrix.runs-on }}"
 
     defaults:
       run:
         shell: bash
 
+    env:
+      EMBEDDED_BINS_BUILDMODE: none
+
     steps:
-      - name: Check out
+      - name: Check out code into the Go module directory
         uses: actions/checkout@v4
         with:
           persist-credentials: false
 
+      - name: Prepare unit tests
+        if: matrix.target-os != ''
+        run: |
+          make --touch .k0sbuild.docker-image.k0s
+          cat <<EOF >>"$GITHUB_ENV"
+          TARGET_OS=${{ matrix.target-os }}
+          GO=go
+          GO_ENV=
+          GOCACHE=${{ env.GITHUB_WORKSPACE }}/build/cache/go/build
+          GOMODCACHE=${{ env.GITHUB_WORKSPACE }}/build/cache/go/mod
+          EOF
+
       - name: Prepare build environment
         run: .github/workflows/prepare-build-env.sh
 
       - name: Set up Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
+        if: matrix.target-os != ''
         with:
           go-version: ${{ env.GO_VERSION }}
+          cache: false
 
       - name: Cache GOCACHE
         uses: actions/cache@v4
         with:
-          key: unittests-k0s-windows-amd64-gocache-${{ github.ref_name }}-${{ github.sha }}
-          restore-keys: |
-            unittests-k0s-windows-amd64-gocache-${{ github.ref_name }}-
+          key: unittests-k0s-${{ matrix.name }}-gocache-${{ github.ref_name }}-${{ github.sha }}
           path: |
-            ~\AppData\Local\go-build
+            build/cache/go/build
 
       - name: Cache GOMODCACHE
         uses: actions/cache@v4
         with:
-          key: unittests-k0s-windows-amd64-gomodcache-${{ hashFiles('go.sum') }}
-          restore-keys: |
-            build-k0s-windows-amd64-gomodcache-${{ hashFiles('go.sum') }}
+          key: unittests-k0s-gomodcache-${{ hashFiles('go.sum') }}
           path: |
-            ~\go\pkg\mod
+            build/cache/go/mod
 
       - name: Run unit tests
-        env:
-          EMBEDDED_BINS_BUILDMODE: none
-          TARGET_OS: windows
-          GO: go
-          GO_ENV: ''
-        run: |
-          make --touch .k0sbuild.docker-image.k0s
-          make check-unit
+        run: make check-unit
 
   smoketests:
     strategy: