[ci] Verify docker contexts

.buildkite/pipelines/docker_context.yml

@@ -0,0 +1,11 @@
+ steps:
+  - command: .buildkite/scripts/steps/docker_context/build.sh
+    label: 'Docker Build Context'
+    agents:
+      queue: n2-4
+    timeout_in_minutes: 30
+    key: build-docker-context
+    retry:
+      automatic:
+        - exit_status: '*'
+          limit: 1

.buildkite/scripts/steps/docker_context/build.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euo pipefail
+
+.buildkite/scripts/bootstrap.sh
+
+echo "--- Create Kibana Docker contexts"
+mkdir -p target
+node scripts/build --skip-initialize --skip-generic-folders --skip-platform-folders --skip-archives
+
+echo "--- Build default context"
+DOCKER_BUILD_FOLDER=$(mktemp -d)
+
+tar -xf target/kibana-[0-9]*-docker-build-context.tar.gz -C "$DOCKER_BUILD_FOLDER"
+cd $DOCKER_BUILD_FOLDER
+docker build .

src/dev/build/tasks/os_packages/docker_generator/run.ts

@@ -76,6 +76,7 @@ export async function runDockerGenerator(
 
   const dockerPush = config.getDockerPush();
   const dockerTagQualifier = config.getDockerTagQualfiier();
+  const publicArtifactSubdomain = config.isRelease ? 'artifacts' : 'snapshots-no-kpi';
 
   const scope: TemplateContext = {
     artifactPrefix,
@@ -100,6 +101,7 @@ export async function runDockerGenerator(
     ironbank: flags.ironbank,
     architecture: flags.architecture,
     revision: config.getBuildSha(),
+    publicArtifactSubdomain,
   };
 
   type HostArchitectureToDocker = Record<string, string>;

src/dev/build/tasks/os_packages/docker_generator/template_context.ts

@@ -22,6 +22,7 @@ export interface TemplateContext {
   baseOSImage: string;
   dockerBuildDate: string;
   usePublicArtifact?: boolean;
+  publicArtifactSubdomain: string;
   ubi?: boolean;
   ubuntu?: boolean;
   cloud?: boolean;

src/dev/build/tasks/os_packages/docker_generator/templates/base/Dockerfile

@@ -22,7 +22,7 @@ RUN {{packageManager}} update && DEBIAN_FRONTEND=noninteractive {{packageManager
 RUN cd /tmp && \
   curl --retry 8 -s -L \
     --output kibana.tar.gz \
-     https://artifacts.elastic.co/downloads/kibana/{{artifactPrefix}}-$(arch).tar.gz && \
+     https://{{publicArtifactSubdomain}}.elastic.co/downloads/kibana/{{artifactPrefix}}-$(arch).tar.gz && \
   cd -
 {{/usePublicArtifact}}