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

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

    datasette publish cloudrun database.db

tests/test_publish_cloudrun.py

@@ -0,0 +1,41 @@
+from click.testing import CliRunner
+from datasette import cli
+from unittest import mock
+
+
+@mock.patch("shutil.which")
+def test_publish_cloudrun_requires_gcloud(mock_which):
+    mock_which.return_value = False
+    runner = CliRunner()
+    with runner.isolated_filesystem():
+        open("test.db", "w").write("data")
+        result = runner.invoke(cli.cli, ["publish", "cloudrun", "test.db"])
+        assert result.exit_code == 1
+        assert "Publishing to Google Cloud requires gcloud" in result.output
+
+
+@mock.patch("shutil.which")
+def test_publish_cloudrun_invalid_database(mock_which):
+    mock_which.return_value = True
+    runner = CliRunner()
+    result = runner.invoke(cli.cli, ["publish", "cloudrun", "woop.db"])
+    assert result.exit_code == 2
+    assert 'Path "woop.db" does not exist' in result.output
+
+
+@mock.patch("shutil.which")
+@mock.patch("datasette.publish.cloudrun.check_output")
+@mock.patch("datasette.publish.cloudrun.check_call")
+def test_publish_cloudrun(mock_call, mock_output, mock_which):
+    mock_output.return_value = "myproject"
+    mock_which.return_value = True
+    runner = CliRunner()
+    with runner.isolated_filesystem():
+        open("test.db", "w").write("data")
+        result = runner.invoke(cli.cli, ["publish", "cloudrun", "test.db"])
+        assert 0 == result.exit_code
+        tag = "gcr.io/{}/datasette".format(mock_output.return_value)
+        mock_call.assert_has_calls([
+            mock.call("gcloud builds submit --tag {}".format(tag), shell=True),
+            mock.call("gcloud beta run deploy --allow-unauthenticated --image {}".format(tag), shell=True)])
+