PMM-14072 Automate Grafana plugin upgrade

Makefile

@@ -30,3 +30,12 @@ docker_clean:
 	docker-compose stop \
 	&& docker-compose rm -f -v \
 	&& docker system prune --volumes -f
+
+.PHONY: upgrade_plugins
+upgrade_plugins:
+	@echo "Upgrading PMM plugins..."
+	@echo "To override the platform, set the PLATFORM environment variable."
+	@echo "Example: PLATFORM=linux/arm64 make upgrade_plugins"
+	@echo
+	@cd misc && \
+	./upgrade-plugins.sh

misc/Dockerfile.upgrade

@@ -0,0 +1,9 @@
+ARG IMAGE_VERSION=grafana/grafana:latest
+FROM ${IMAGE_VERSION}
+
+USER root
+
+# No need to run the server, we want to exit after the upgrade
+RUN sed -i '/exec grafana server/,$d' /run.sh
+
+USER grafana

misc/upgrade-plugins.sh

@@ -0,0 +1,23 @@
+#!/bin/bash -ex
+
+declare PLATFORM=${PLATFORM:-linux/amd64}
+declare DIR
+DIR=$(realpath ../panels)
+
+# Note: the PLATFORM matters because some plugins are built for a specific architecture.
+docker buildx build --platform="$PLATFORM" --progress=plain -t local/grafana -f Dockerfile.upgrade .
+
+rm -rf "${DIR:?}"/*
+
+docker run \
+  --rm -t \
+  --name grafana \
+  --platform="$PLATFORM" \
+  -e GF_INSTALL_PLUGINS=grafana-clickhouse-datasource,grafana-polystat-panel,jdbranham-diagram-panel \
+  -v "${DIR}":/var/lib/grafana/plugins \
+  local/grafana
+
+echo "Listing upgraded Grafana plugins..."
+ls -l "$DIR"
+
+docker rmi local/grafana