Chore: Rename plugin CI image as grafana/grafana-plugin-ci:latest-alpine (#26106)

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

packages/grafana-toolkit/docker/grafana-plugin-ci-alpine/README.md

 # Using this docker image
 
-Currently tagged and uploaded to dockerhub as srclosson/integrations-ci-build 
+Uploaded to dockerhub as grafana/grafana-plugin-ci:latest-alpine
 
 Based off of `circleci/node:12-browsers` 
 

packages/grafana-toolkit/docker/grafana-plugin-ci-alpine/common.sh

@@ -4,4 +4,4 @@
 ## Common variable declarations
 ##
 
-DOCKER_IMAGE_NAME="srclosson/grafana-plugin-ci-alpine"
+DOCKER_IMAGE_NAME="grafana/grafana-plugin-ci:latest-alpine"

packages/grafana-toolkit/docker/grafana-plugin-ci-alpine/test/docker-compose.yml

@@ -9,7 +9,7 @@ services:
       - ${HOME}/.ssh:/root/.ssh
       - ../../..:/home/circleci/grafana-toolkit
   cibuilt:
-    image: "srclosson/grafana-plugin-ci-alpine"
+    image: "grafana/grafana-plugin-ci:latest-alpine"
     user: root
     volumes:
       - ../scripts:/home/circleci/scripts