feat: Migrate docker preview repo stuff in monorepo (#25698)

* feat: Migrate docker preview repo stuff in monorepo

* docs: Update docs [skip ci]

* config: Update configuration to minimum [skip ci]

server/build/docker-preview/Dockerfile

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+# Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+# See License.txt for license information.
+FROM postgres:12
+
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 467B942D3A79BD29
+RUN apt-get update && apt-get install -y ca-certificates
+
+ARG MATTERMOST_VERSION
+#
+# Configure PostgreSQL
+#
+
+ENV POSTGRES_USER=mmuser
+ENV POSTGRES_PASSWORD=mostest
+ENV POSTGRES_DB=mattermost_test
+
+#
+# Configure Mattermost
+#
+WORKDIR /mm
+
+# Copy over files
+ADD https://releases.mattermost.com/${MATTERMOST_VERSION}/mattermost-team-${MATTERMOST_VERSION}-linux-amd64.tar.gz .
+RUN tar -zxvf mattermost-team-${MATTERMOST_VERSION}-linux-amd64.tar.gz
+ADD config_docker.json ./mattermost/config/config_docker.json
+ADD docker-entry.sh .
+
+RUN chmod +x ./docker-entry.sh
+ENTRYPOINT ./docker-entry.sh
+
+# Mattermost environment variables
+ENV PATH="/mm/mattermost/bin:${PATH}"
+
+# Create default storage directory
+RUN mkdir ./mattermost-data
+VOLUME /mm/mattermost-data
+
+# Ports
+EXPOSE 8065

server/build/docker-preview/README.md

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+# Mattermost Docker Preview Image
+
+This is a Docker image to install Mattermost in *Preview Mode* for exploring product functionality on a single machine using Docker.
+
+Note: This configuration should not be used in production, as it’s using a known password string and contains other non-production configuration settings, and it does not support upgrade. If you’re looking for a production installation with Docker, please see the [Mattermost Production Docker Deployment Guide](https://docs.mattermost.com/install/install-docker.html#deploy-mattermost-on-docker-for-production-use).
+
+To contribute, please see [Contribution Guidelines](https://developers.mattermost.com/contribute/more-info/getting-started/).
+
+To file issues, [search for existing bugs and file a GitHub issue if your bug is new](https://developers.mattermost.com/contribute/why-contribute/#youve-found-a-bug).
+
+## Usage
+
+Please see [documentation for usage](http://docs.mattermost.com/install/docker-local-machine.html).
+
+If you have Docker already set up, you can run this image in one line:
+
+```
+docker run --name mattermost-preview -d --publish 8065:8065 --add-host dockerhost:127.0.0.1 mattermost/mattermost-preview
+```

server/build/docker-preview/config_docker.json

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+{
+    "ServiceSettings": {
+        "EnableOAuthServiceProvider": true,
+        "EnableDeveloper": false,
+        "EnableGifPicker": true
+    },
+    "SqlSettings": {
+        "DriverName": "postgres",
+        "DataSource": "postgres://mmuser:mostest@localhost/mattermost_test?sslmode=disable\u0026connect_timeout=10\u0026binary_parameters=yes",
+        "AtRestEncryptKey": ""
+    },
+    "FileSettings": {
+        "DriverName": "local",
+        "Directory": "/mm/mattermost-data",
+        "PublicLinkSalt": ""
+    },
+    "EmailSettings": {
+        "SMTPServer": "",
+        "SMTPPort": "",
+        "PushNotificationContents": "generic"
+    },
+    "ElasticsearchSettings": {
+        "ConnectionUrl": ""
+    },
+    "PluginSettings": {
+        "EnableUploads": true,
+        "PluginStates": {}
+    }
+}

server/build/docker-preview/docker-entry.sh

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+#!/bin/bash
+# Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+# See License.txt for license information.
+
+echo "Starting PostgreSQL"
+docker-entrypoint.sh -c 'shared_buffers=256MB' -c 'max_connections=300' &
+
+until pg_isready -hlocalhost -p 5432 -U "$POSTGRES_USER" &> /dev/null; do
+	echo "postgres still not ready, sleeping"
+	sleep 5
+done
+
+echo "Updating CA certificates"
+update-ca-certificates --fresh >/dev/null
+
+echo "Starting platform"
+cd mattermost
+exec ./bin/mattermost --config=config/config_docker.json