Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/scripts/download_mmctl_release.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# $1 - version to download
+
+if [[ "$OS" = "Windows_NT" ]]
+then
+  PLATFORM="Windows"
+else
+  PLATFORM=$(uname)-$(uname -m)
+fi
+
+if [[ ! -z "$1" ]];
+then
+  OVERRIDE_OS=$1
+fi
+
+BIN_PATH=${2:-bin}
+
+# strip whitespace
+THIS_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+if [[ "$THIS_BRANCH" =~ 'release-'[0-9] ]];
+then
+  RELEASE_TO_DOWNLOAD=$(echo $THIS_BRANCH | grep -Eo 'release-([0-9](\.){0,1})\.([0-9](\.){0,1})')
+else
+  RELEASE_TO_DOWNLOAD=master
+fi
+
+echo "Downloading prepackaged binary: https://releases.mattermost.com/mmctl/$RELEASE_TO_DOWNLOAD";
+
+# When packaging we need to download different platforms
+# Values need to match the case statement below
+if [[ ! -z "$OVERRIDE_OS" ]];
+then
+  PLATFORM="$OVERRIDE_OS"
+fi
+
+case "$PLATFORM" in
+
+Linux-x86_64)
+  MMCTL_FILE="linux_amd64.tar" && curl -f -O -L https://releases.mattermost.com/mmctl/"$RELEASE_TO_DOWNLOAD"/"$MMCTL_FILE" && tar -xvf "$MMCTL_FILE" -C "$BIN_PATH" && rm "$MMCTL_FILE";
+  ;;
+
+Linux-aarch64)
+  MMCTL_FILE="linux_arm64.tar" && curl -f -O -L https://releases.mattermost.com/mmctl/"$RELEASE_TO_DOWNLOAD"/"$MMCTL_FILE" && tar -xvf "$MMCTL_FILE" -C "$BIN_PATH" && rm "$MMCTL_FILE";
+  ;;
+
+Darwin-x86_64)
+  MMCTL_FILE="darwin_amd64.tar" && curl -f -O -L https://releases.mattermost.com/mmctl/"$RELEASE_TO_DOWNLOAD"/"$MMCTL_FILE" && tar -xvf "$MMCTL_FILE" -C "$BIN_PATH" && rm "$MMCTL_FILE";
+  ;;
+
+Darwin-arm64)
+  MMCTL_FILE="darwin_arm64.tar" && curl -f -O -L https://releases.mattermost.com/mmctl/"$RELEASE_TO_DOWNLOAD"/"$MMCTL_FILE" && tar -xvf "$MMCTL_FILE" -C "$BIN_PATH" && rm "$MMCTL_FILE";
+  ;;
+
+Windows)
+  MMCTL_FILE="windows_amd64.zip" && curl -f -O -L https://releases.mattermost.com/mmctl/"$RELEASE_TO_DOWNLOAD"/"$MMCTL_FILE" && unzip -o "$MMCTL_FILE" -d "$BIN_PATH" && rm "$MMCTL_FILE";
+  ;;
+
+*)
+  echo "error downloading mmctl: can't detect OS";
+  ;;
+
+esac