Add optional pull request release tests CI job

.ci/jobs.t/elastic+elasticsearch+pull-request+release-tests.yml

@@ -0,0 +1,49 @@
+---
+- job:
+    name: "elastic+elasticsearch+pull-request+release-tests"
+    display-name: "elastic / elasticsearch - pull request release-tests"
+    description: "Testing of Elasticsearch pull requests - release-tests"
+    workspace: "/dev/shm/elastic+elasticsearch+pull-request+release-tests"
+    scm:
+      - git:
+          refspec: "+refs/pull/${ghprbPullId}/*:refs/remotes/origin/pr/${ghprbPullId}/*"
+          branches:
+            - "${ghprbActualCommit}"
+    triggers:
+      - github-pull-request:
+          org-list:
+            - elastic
+          allow-whitelist-orgs-as-admins: true
+          trigger-phrase: '.*run\W+elasticsearch-ci/release-tests.*'
+          github-hooks: true
+          status-context: elasticsearch-ci/release-tests
+          cancel-builds-on-update: true
+          excluded-regions:
+            - ^docs/.*
+          white-list-labels:
+            - 'test-release'
+          black-list-target-branches:
+            - 7.15
+            - 6.8
+    builders:
+      - inject:
+          properties-file: '.ci/java-versions.properties'
+          properties-content: |
+            JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
+            RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
+            JAVA8_HOME=$HOME/.java/java8
+            JAVA11_HOME=$HOME/.java/java11
+            JAVA15_HOME=$HOME/.java/openjdk15
+      - shell: |
+          #!/usr/local/bin/runbld --redirect-stderr
+
+          # Fetch beats artifacts
+          export ES_VERSION=$(grep 'elasticsearch' build-tools-internal/version.properties | awk '{print $3}')
+          export BEATS_DIR=$(pwd)/distribution/docker/build/artifacts/beats
+
+          mkdir -p ${BEATS_DIR}
+          curl -o "${BEATS_DIR}/metricbeat-${ES_VERSION}-linux-x86_64.tar.gz" https://snapshots-no-kpi.elastic.co/downloads/beats/metricbeat/metricbeat-${ES_VERSION}-SNAPSHOT-linux-x86_64.tar.gz
+          curl -o "${BEATS_DIR}/filebeat-${ES_VERSION}-linux-x86_64.tar.gz" https://snapshots-no-kpi.elastic.co/downloads/beats/filebeat/filebeat-${ES_VERSION}-SNAPSHOT-linux-x86_64.tar.gz
+
+          $WORKSPACE/.ci/scripts/run-gradle.sh -Dbwc.checkout.align=true -Dbuild.snapshot=false \
+            -Dtests.jvm.argline=-Dbuild.snapshot=false -Dlicense.key=${WORKSPACE}/x-pack/license-tools/src/test/resources/public.key -Dbuild.id=deadbeef build