Add experimental build for identifying docker-compose issues in CI

Signed-off-by: Mark Vieira <[email protected]>

Author: mark-vieira

.ci/jobs.t/elastic+elasticsearch+{branch}+docker-test-ramdisk.yml

@@ -0,0 +1,15 @@
+- job:
+    name: elastic+elasticsearch+%BRANCH%+docker-test-ramdisk
+    workspace: /dev/shm/elastic+elasticsearch+%BRANCH%+docker-test
+    display-name: "elastic / elasticsearch # %BRANCH% - docker test ramdisk (experimental)"
+    description: "Experimental test job to shake out issues with Docker in CI\n"
+    node: "(debian-10 || sles-12 || debian-8 || sles-15) && immutable"
+    triggers:
+      - timed: "H/10 * * * *"
+    builders:
+      - inject:
+          properties-content: |
+            WORKSPACE=/dev/shm/elastic+elasticsearch+%BRANCH%+docker-test
+      - shell: |
+          #!/usr/local/bin/runbld --redirect-stderr --last-good-commit elastic+elasticsearch+%BRANCH%+git+push
+          .ci/build.sh -Dbwc.checkout.align=true -p test.fixtures composeUp