Add gcloud-pubsub-events plugin build

Also add the ability to use a target Gerrit branch
different than the plugin's one and make it work also
when the gerrit remote is already defined by the SCM
source.

Change-Id: I23929eecb1a23bb57842af2cd5af7bd69c74ae43

jenkins/gerrit-bazel-build-plugin-branch.sh

diff --git a/jenkins/gerrit-bazel-build-plugin-branch.sh b/jenkins/gerrit-bazel-build-plugin-branch.sh
index 2bdb215..042ead1 100644
--- a/jenkins/gerrit-bazel-build-plugin-branch.sh
+++ b/jenkins/gerrit-bazel-build-plugin-branch.sh
@@ -11,7 +11,7 @@
 
 echo "Building plugin {name}/{branch} with Gerrit/{gerrit-branch}"
 
-git remote add gerrit https://gerrit.googlesource.com/a/gerrit
+git remote show gerrit > /dev/null 2>&1 || git remote add gerrit https://gerrit.googlesource.com/a/gerrit
 git fetch gerrit {gerrit-branch}
 git checkout -fb {gerrit-branch} gerrit/{gerrit-branch}
 git submodule update --init

jenkins/gerrit-bazel-plugin-gcloud-pubsub-events.yaml

diff --git a/jenkins/gerrit-bazel-plugin-gcloud-pubsub-events.yaml b/jenkins/gerrit-bazel-plugin-gcloud-pubsub-events.yaml
new file mode 100644
index 0000000..2dfa647
--- /dev/null
+++ b/jenkins/gerrit-bazel-plugin-gcloud-pubsub-events.yaml
@@ -0,0 +1,10 @@
+- project:
+    name: gcloud-pubsub-events
+    repo: gcloud-pubsub-events
+    organization: GerritForge
+    jobs:
+      - 'plugin-{name}-gh-bazel-{branch}-{gerrit-branch}':
+          branch:
+            - master
+          gerrit-branch:
+            - stable-3.3

jenkins/gerrit-bazel-plugin-gh-template.yaml

diff --git a/jenkins/gerrit-bazel-plugin-gh-template.yaml b/jenkins/gerrit-bazel-plugin-gh-template.yaml
index 7f6e970..14bb521 100644
--- a/jenkins/gerrit-bazel-plugin-gh-template.yaml
+++ b/jenkins/gerrit-bazel-plugin-gh-template.yaml
@@ -55,3 +55,18 @@
       - archive:
           artifacts: >
             bazel-bin/plugins/{name}/{name}.jar*,bazel-bin/plugins/{name}/{name}.json
+
+- job-template:
+    name: 'plugin-{name}-gh-bazel-{branch}-{gerrit-branch}'
+    description: >
+      Plugin {name} {branch} branch owned by {organization}
+      and hosted on GitHub and built with Bazel for Gerrit {gerrit-branch}
+    defaults: plugin-gh-template
+    builders:
+      - set-git-credentials
+      - shell: !include-raw: gerrit-bazel-build-plugin-branch.sh
+      - shell: !include-raw: gerrit-bazel-gh-get-plugin-info.sh
+    publishers:
+      - archive:
+          artifacts: >
+            bazel-bin/plugins/{name}/{name}.jar*,bazel-bin/plugins/{name}/{name}.json