Add tiny load testing script

.github/CODEOWNERS

@@ -67,6 +67,7 @@
 /components/ws-proxy @gitpod-io/engineering-workspace
 /dev/gpctl @gitpod-io/engineering-workspace
 /dev/loadgen @gitpod-io/engineering-workspace
+/dev/preview @gitpod-io/platform
 /operations/observability/mixins @gitpod-io/platform
 /operations/observability/mixins/IDE @gitpod-io/engineering-ide
 /operations/observability/mixins/meta @gitpod-io/engineering-webapp

dev/preview/test/load-test.sh

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+#
+# This script makes it possible to run load tests against VM-based preview
+# environments.
+#
+# Usage:
+#   ./dev/preview/test/load-test.sh
+#   ./dev/preview/test/load-test.sh --base-branch-name my-load-test-base-branch-name --start 1 --end 5
+#
+
+set -euo pipefail
+
+function log {
+    echo "[$(date)] $*"
+}
+
+START=1
+END=15
+BASE_BRANCH_NAME="vm-load-test"
+
+opts=$(getopt \
+  --longoptions "start:,end:,base-branch-name:" \
+  --name "$(basename "$0")" \
+  --options "" \
+  -- "$@"
+)
+
+eval set -- "$opts"
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --start) START=$2 ; shift 2 ;;
+    --end) END=$2 ; shift 2 ;;
+    --base-branch-name) BASE_BRANCH_NAME=$2 ;  shift 2 ;;
+    *) break ;;
+  esac
+done
+
+while true; do
+    read -rp "
+Are you sure you want to run the load test with the following configuration?
+
+START=${START}
+END=${END}
+BASE_BRANCH_NAME=${BASE_BRANCH_NAME}
+
+y/n: " yn
+    case "$yn" in
+        [Yy]* ) break;;
+        [Nn]* ) echo "Aborting load test" ; exit 0;;
+        * ) echo "Please answer y/n";;
+    esac
+done
+
+log "Creating base branch ${BASE_BRANCH_NAME}"
+git checkout -b "${BASE_BRANCH_NAME}"
+git commit --allow-empty -m "Prepare load test" -m "/werft with-vm=true"
+
+for number in $(seq "${START}" "${END}"); do
+    branch="${BASE_BRANCH_NAME}-${number}"
+
+    log "Creating and pushing branch ${branch}"
+    git checkout -b "${branch}"
+    git push -u origin "${branch}"
+
+    log "Back to base branch ${BASE_BRANCH_NAME}"
+    git checkout "${BASE_BRANCH_NAME}"
+
+    log "Sleeping 30 seconds"
+    sleep 30
+done