Add make test execution for macos-10.15

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

.github/workflows/e2e.yaml

@@ -79,3 +79,24 @@ jobs:
         run: |
           kind delete cluster --name ${{ steps.prep.outputs.CLUSTER }}
           rm /tmp/${{ steps.prep.outputs.CLUSTER }}
+
+  # Runs 'make test' on macos-10.15 to assure development environment for 
+  # contributors using MacOS.
+  darwin-amd64:
+    runs-on: macos-10.15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17.x
+      - name: Restore Go cache
+        uses: actions/cache@v1
+        with:
+          path: /home/runner/work/_temp/_github_home/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+      - name: Run tests
+        run: make test