[SPARK-35483][INFRA] Add docker-integration-tests to run-tests.py and GA

[sarutak]

What changes were proposed in this pull request?

This PR proposes to add docker-integratin-tests to run-tests.py and GA.
Once #32631 was merged but there was a lack of consideration.

Diff between this change and 692d95d merged in #32631 is as follows.

       if: github.repository != 'apache/spark'
       id: sync-branch
       run: |
+        apache_spark_ref=`git rev-parse HEAD`
         git fetch https://github.com/$GITHUB_REPOSITORY.git ${GITHUB_REF#refs/heads/}
         git -c user.name='Apache Spark Test Account' -c user.email='sparktestacc@gmail.com' merge --no-commit --progress --squash FETCH_HEAD
         git -c user.name='Apache Spark Test Account' -c user.email='sparktestacc@gmail.com' commit -m "Merged commit"
+        echo "::set-output name=APACHE_SPARK_REF::$apache_spark_ref"
     - name: Cache Scala, SBT and Maven
       uses: actions/cache@v2
       with:

Why are the changes needed?

CI for docker-integration-tests is absent for now.

Does this PR introduce any user-facing change?

GA.

How was this patch tested?

[sarutak]

cc: @HyukjinKwon
Thank you for letting me know about the issue.
I believe this change can fix it.

[HyukjinKwon]

LGTM

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/43569/

[HyukjinKwon]

Merged to master.

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/43569/

[SparkQA]

Test build #139049 has finished for PR 32691 at commit bdbfea5.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.