Feature/geode 7745 (apache#4667)

* GEODE-7745 : Fix the missing Pull Request builds in geode.

Change the githubpull request resource to use digitalocean's repo which
seems to have the patch fix for the commit check.

Signed-off-by: Steve Sienkowski <[email protected]>

* GEODE-7745: Fix the missing Pull Request builds in geode.

Create the docker image for github-pr-resource that uses the
digitalocean repo.This repo has the patch fix which pull requests get
triggered.

Signed-off-by: Bala Kaza Venkata <[email protected]>

* GEODE-7745: Fix the missing Pull Request builds in geode.

Update the alpine base image  for the github pr resource builder
to be the pipeline specific one.

ci/pipelines/images/jinja.template.yml

@@ -188,7 +188,7 @@ jobs:
   public: ((public-pipelines))
   serial: true
   plan:
-    - get: alpine-tools-image
+    - get: alpine-tools-docker-image
       passed: [build-alpine-tools-docker-image]
     - get:  github-pr-resource-dockerfile
     - put: github-pr-resource-image