woodpecker tests with DinD

.woodpecker/test.yaml

@@ -0,0 +1,27 @@
+when:
+  - event: push
+    branch: main
+
+steps:
+  - name: test
+    # image: docker:cli # use 'docker:<major-version>-cli' or similar in production
+    image: golang
+    environment:
+      DOCKER_HOST: 'tcp://docker:2376'
+      DOCKER_CERT_PATH: '/dind-certs/client'
+      DOCKER_TLS_VERIFY: '1'
+    volumes:
+      - /opt/woodpeckerci/dind-certs:/dind-certs
+    commands:
+      - go test ./...
+
+services:
+  - name: docker
+    image: docker:dind # use 'docker:<major-version>-dind' or similar in production
+    privileged: true
+    environment:
+      DOCKER_TLS_CERTDIR: /dind-certs
+    volumes:
+      - /opt/woodpeckerci/dind-certs:/dind-certs
+    ports:
+      - 2376