Move entrypoint for running integration tests inside docker

Author: donoghuc

.buildkite/pull_request_pipeline.yml

@@ -140,7 +140,8 @@ steps:
     command: |
       set -euo pipefail
 
-      ci/run-integration-tests-fips.sh 0
+      docker build -t test-runner-image -f x-pack/distributions/internal/observabilitySRE/docker/Dockerfile .
+      docker run test-runner-image ci/run-fips-integration-tests.sh 0
 
   - label: ":lab_coat: Integration Tests - FIPS mode / part 2"
     key: "integration-tests-fips-part-2"
@@ -157,7 +158,8 @@ steps:
     command: |
       set -euo pipefail
 
-      ci/run-integration-tests-fips.sh 1
+      docker build -t test-runner-image -f x-pack/distributions/internal/observabilitySRE/docker/Dockerfile .
+      docker run test-runner-image ci/run-fips-integration-tests.sh 1
 
   - label: ":lab_coat: Integration Tests / part 1"
     key: "integration-tests-part-1"

ci/run-fips-integration-tests.sh

@@ -4,9 +4,6 @@
 # half_number: 0 for first half, 1 for second half
 
 half_number=$1
-docker build -t test-runner-image -f x-pack/distributions/internal/observabilitySRE/docker/Dockerfile .
-docker run test-runner-image /bin/bash -c "
-    source ci/get-test-half.sh
-    specs=$(get_test_half $half_number)
-    ./gradlew --info --stacktrace -PrunTestsInFIPSMode=true runIntegrationTests -PrubyIntegrationSpecs=\"\$specs\"
-"
+source ci/get-test-half.sh
+specs=$(get_test_half "$half_number")
+./gradlew --info --stacktrace -PrunTestsInFIPSMode=true runIntegrationTests -PrubyIntegrationSpecs="$specs"