ci: add mac os to matrix tests

Signed-off-by: Boris Glimcher <[email protected]>

Author: glimchb

.github/workflows/test.yml

@@ -3,7 +3,7 @@ name: test
 on: [push, pull_request]
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: macos-latest
     strategy:
       matrix:
         go: [ '1.18', '1.19', '1.20', '1.21' ]
@@ -17,6 +17,18 @@ jobs:
           version: v1.13.0
           install-only: true
 
+      - name: Setup docker (missing on MacOS)
+        if: contains(runner.os, 'macos')
+        run: |
+          brew install docker
+          colima start
+
+      # See https://github.com/abiosoft/colima/blob/main/docs/FAQ.md#cannot-connect-to-the-docker-daemon-at-unixvarrundockersock-is-the-docker-daemon-running
+      # - name: Set Docker socket on macOS
+      #   if: contains(matrix.os, 'macos')
+      #   run: |
+      #     echo DOCKER_HOST="unix://${HOME}/.colima/default/docker.sock" >> $GITHUB_ENV
+
       - run: |
           go version
           go env