Fixes for Iron Bank

[pugnascotia]

Just keeping the Iron Bank Docker build in sync.

[elasticmachine]

Pinging @elastic/es-delivery (Team:Delivery)

[elasticsearchmachine]

💚 Backport successful

Status	Branch	Result
✅	7.x

[spalger]

Our 7.x and master builds of ES started failing today with the error:

from https://kibana-ci.elastic.co/job/elasticsearch+snapshots+build/2864/consoleFull

> ./gradlew -Dbuild.docker=true assemble --parallel
...
19:43:28  > Task :distribution:docker:transformUbiDockerContext
19:43:40  
19:43:40  > Task :distribution:docker:buildIronBankDockerImage FAILED
19:43:40  Exec output and error:
19:43:40  | Output for docker:Sending build context to Docker daemon  332.7MB

19:43:40  | Step 1/30 : ARG BASE_REGISTRY=registry1.dso.mil
19:43:40  | Step 2/30 : ARG BASE_IMAGE=ironbank/redhat/ubi/ubi8
19:43:40  | Step 3/30 : ARG BASE_TAG=8.4
19:43:40  | Step 4/30 : FROM ${BASE_REGISTRY}/${BASE_IMAGE}:${BASE_TAG} AS builder
19:43:40  |  ---> 0ced1c7c9b23
19:43:40  | Step 5/30 : COPY tini /bin/tini
19:43:40  |  ---> b8601bce3486
19:43:40  | Step 6/30 : RUN chmod 0555 /bin/tini
19:43:40  |  ---> Running in 9628b5fa5ed4
19:43:40  | Removing intermediate container 9628b5fa5ed4
19:43:40  |  ---> b36e2be4b353
19:43:40  | Step 7/30 : RUN mkdir /usr/share/elasticsearch
19:43:40  |  ---> Running in aae716acd67a
19:43:40  | Removing intermediate container aae716acd67a
19:43:40  |  ---> cf4925c20bec
19:43:40  | Step 8/30 : WORKDIR /usr/share/elasticsearch
19:43:40  |  ---> Running in 3b1690f899c0
19:43:40  | Removing intermediate container 3b1690f899c0
19:43:40  |  ---> 3c524b2e84eb
19:43:40  | Step 9/30 : COPY elasticsearch-7.14.0-linux-x86_64.tar.gz /opt/elasticsearch.tar.gz
19:43:40  | COPY failed: file not found in build context or excluded by .dockerignore: stat elasticsearch-7.14.0-linux-x86_64.tar.gz: file does not exist
19:43:55  
19:43:55  > Task :distribution:docker:buildDockerImage
19:43:59  > Task :distribution:docker:buildUbiDockerImage
19:49:20  
19:49:20  FAILURE: Build failed with an exception.
19:49:20  
19:49:20  * What went wrong:
19:49:20  Execution failed for task ':distribution:docker:buildIronBankDockerImage'.
19:49:20  > A failure occurred while executing org.elasticsearch.gradle.internal.docker.DockerBuildTask$DockerBuildAction
19:49:20     > Process 'command 'docker'' finished with non-zero exit value 1
19:49:20  
19:49:20  * Try:
19:49:20  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
19:49:20  
19:49:20  * Get more help at https://help.gradle.org
19:49:20  
19:49:20  BUILD FAILED in 18m 17s
19:49:20  1407 actionable tasks: 1407 executed

Do you think this PR might have caused this?

[pugnascotia]

It's definitely this PR. I've reverted the commits on master and 7.x while I investigate. I think the release-manager was trying to build actual Iron Bank Docker images, which it doesn't need to.