build: Ephemeral environments for PRs via slash command (#13189)

* First pass at ephemeral env, new Docker ci target

* Add service checks, get public IP

* Separate issue_comment and workflow_run jobs

* Refactor workflows

* Adjust comment author association

* Checkout code

* Fix image name, manage service desired task count

* Use merge commit sha

* Fix IP output, add failure comment

* Refactor comment parsing & env spinup

* Check container image publish status

* Parse AWS account ID from registry URL

* Use PR number rather than variable merge commit SHA for image tag

* Fix docker push conditional

* Push multiple tags to ECR

* Fix comment author check

* Refactor comment body check

* Provision service with active task to get correct IP

* /testenv up

* Add @mentions to PR comments, env var cleanup

docker/docker-ci.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+/app/docker/docker-init.sh
+
+# TODO: copy config overrides from ENV vars
+
+# TODO: run celery in detached state
+
+# start up the web server
+gunicorn \
+    --bind  "0.0.0.0:${SUPERSET_PORT}" \
+    --access-logfile '-' \
+    --error-logfile '-' \
+    --workers 1 \
+    --worker-class gthread \
+    --threads 8 \
+    --timeout 60 \
+    --limit-request-line 0 \
+    --limit-request-field_size 0 \
+    "${FLASK_APP}"