mount working dir with drone exec

.drone.star

@@ -0,0 +1,105 @@
+# go version
+go = "golang:1.13"
+
+# docker repository
+repo = "drone/drone-runner-docker"
+
+def main(ctx):
+    return [
+        pipeline_linux(),
+        pipeline_windows("1903"),
+        pipeline_windows("1809"),
+        pipeline_manifest(),
+        # manifest
+    ]
+
+
+def pipeline_linux():
+    return  {
+        "kind": "pipeline",
+        "type": "docker",
+        "name": "linux",
+        "steps": [
+            test,
+            build,
+            publish("arm"),
+            publish("arm64"),
+            publish("amd64"),
+        ]
+    }
+
+def pipeline_windows(version):
+    return {
+        "kind": "pipeline",
+        "type": "ssh",
+        "name": "windows_%s" % version,
+        "server": {
+
+        },
+        "platform": {
+            "os": "windows",
+        },
+        "steps": [
+            "sh scripts/ci_%s.ps1" % version,
+        ],
+    }
+
+def pipeline_manifest():
+    return [
+        "kind": "pipeline",
+        "type": "docker",
+        "name": "linux",
+        "steps": [
+            {
+
+            }
+        ]
+    ]
+
+# publish creates a docker publish step.
+def publish(arch):
+    return {
+        "name": "publish_%s" % arch,
+        "image": "plugins/docker",
+        "pull": "if-not-exists",
+        "settings": {
+            "auto_tag": "true",
+            "auto_tag_suffix": "linux-%s" % arch,
+            "dockerfile": "docker/Dockerfile.linux.%s" % arch,
+            "repo": repo,
+        },
+        "when": {
+            "event": [ "push", "tag" ]
+        }
+    }
+
+# test defines a test step that downloads
+# dependencies and tests the packages.
+test = {
+    "name": "test",
+    "image": go,
+    "volumes": mounts,
+    "commands": [
+        "go test -v ./...",
+    ],
+}
+
+# build defines a build step that compiles
+# the binaries.
+build = {
+    "name": "build",
+    "image": go,
+    "volumes": mounts,
+    "commands": [
+        "sh scripts/build.sh",
+    ],
+    "when": {
+        "event": [ "push", "tag" ]
+    }
+}
+
+# mount points shared by all steps.
+mounts = [{
+    "name": "go",
+    "path": "/go",
+}]