datasette publish cloudrun (#434) - thanks, @rprimet

New publish subcommand that publishes using the
new Google Cloud Run platform.

    datasette publish cloudrun database.db

datasette/publish/cloudrun.py

@@ -0,0 +1,71 @@
+from datasette import hookimpl
+import click
+import json
+from subprocess import check_call, check_output
+
+from .common import (
+    add_common_publish_arguments_and_options,
+    fail_if_publish_binary_not_installed,
+)
+from ..utils import temporary_docker_directory
+
+
+@hookimpl
+def publish_subcommand(publish):
+    @publish.command()
+    @add_common_publish_arguments_and_options
+    @click.option(
+        "-n",
+        "--name",
+        default="datasette",
+        help="Application name to use when deploying",
+    )
+    @click.option("--spatialite", is_flag=True, help="Enable SpatialLite extension")
+    def cloudrun(
+        files,
+        metadata,
+        extra_options,
+        branch,
+        template_dir,
+        plugins_dir,
+        static,
+        install,
+        version_note,
+        title,
+        license,
+        license_url,
+        source,
+        source_url,
+        about,
+        about_url,
+        name,
+        spatialite,
+    ):
+        fail_if_publish_binary_not_installed("gcloud", "Google Cloud", "https://cloud.google.com/sdk/")
+        project = check_output("gcloud config get-value project", shell=True, universal_newlines=True).strip()
+
+        with temporary_docker_directory(
+            files,
+            name,
+            metadata,
+            extra_options,
+            branch,
+            template_dir,
+            plugins_dir,
+            static,
+            install,
+            spatialite,
+            version_note,
+            {
+                "title": title,
+                "license": license,
+                "license_url": license_url,
+                "source": source,
+                "source_url": source_url,
+                "about": about,
+                "about_url": about_url,
+            },
+        ):
+            image_id = "gcr.io/{project}/{name}".format(project=project, name=name)
+            check_call("gcloud builds submit --tag {}".format(image_id), shell=True)
+        check_call("gcloud beta run deploy --allow-unauthenticated --image {}".format(image_id), shell=True)