[10.0.x] NO-ISSUE: fix env.DISABLE_IMAGES_DEPLOY evaluation

[jstastny-cz]

Fixing boolean evaluation of env.DISABLE_IMAGES_DEPLOY variable.

Tested by "re-playing" the 10.0.x pipelines in Jenkins which resulted in correct param.DEPLOY_IMAGE being passed to the build-image job variant.

[kie-ci3]

PR job #1 was: UNSTABLE
Possible explanation: This should be test failures

Please look here: https://ci-builds.apache.org/job/KIE/job/kogito/job/10.0.x/job/pullrequest/job/kogito-images.build-and-test/1/display/redirect
See console log:

Console Logs

Starting building: KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image #6
Starting building: KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image #1
Starting building: KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image #5
Starting building: KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image #2
Starting building: KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image #7
Build KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image PR #1787 - kogito-base-builder: https://github.com//pull/1787 completed: SUCCESS
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Build KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image PR #1787 - kogito-jit-runner: https://github.com//pull/1787 completed: SUCCESS
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Build KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image PR #1787 - kogito-data-index-postgresql: https://github.com//pull/1787 completed: SUCCESS
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Build KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image PR #1787 - kogito-jobs-service-ephemeral: https://github.com//pull/1787 completed: SUCCESS
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Build KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image PR #1787 - kogito-data-index-ephemeral: https://github.com//pull/1787 completed: SUCCESS
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Build KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image PR #1787 - kogito-jobs-service-postgresql: https://github.com//pull/1787 completed: SUCCESS
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[Pipeline] // stage
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Build KIE » kogito » 10.0.x » pullrequest » kogito-images.build-image PR #1787 - kogito-jobs-service-allinone: https://github.com//pull/1787 completed: UNSTABLE
[Pipeline] unstable
WARNING: Tests on kogito-jobs-service-allinone seems to have failed
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[Pipeline] stage
[Pipeline] { (Declarative: Post Actions)
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[Pipeline] sh
+ wget --no-check-certificate -qO - 'https://ci-builds.apache.org/job/KIE/job/kogito/job/10.0.x/job/pullrequest/job/kogito-images.build-and-test/1/api/json?depth=0'
[Pipeline] readJSON
[Pipeline] sh