RANGER-5301: Fix InvalidDefaultArgInFrom Warnings in docker build

[kumaab]

What changes were proposed in this pull request?

Warnings from BuildKit during the docker build:

2025-08-29T04:59:18.8132073Z #2 WARN: InvalidDefaultArgInFrom: Default value for ARG ${RANGER_BASE_IMAGE}:${RANGER_BASE_VERSION} results in empty or invalid base image name (line 20)
2025-08-29T04:59:18.8133508Z #2 WARN: InvalidDefaultArgInFrom: Default value for ARG ranger_${RANGER_DB_TYPE} results in empty or invalid base image name (line 61)

To silence these warnings, the best way seems to be to use sentinel placeholders instead of duplicating raw values from .env file. Maintaining versions in multiple files is an overhead so using placeholders is a good approach to take.

Update

Using placeholders doesn't solve the warnings, so using default values - the values may remain the same over time as overrides are in place using docker compose

How was this patch tested?

The warnings are no longer seen in the docker builds in CI.

[Copilot]

Pull request overview

This PR addresses BuildKit warnings during Docker builds by adding sentinel placeholder values to ARG declarations in Dockerfiles. The warnings occurred because ARG variables used in FROM statements had no default values, resulting in empty or invalid base image names during validation.

Changes:

• Added sentinel placeholder default values (e.g., _RANGER_BASE_IMAGE_, _ZK_VERSION_) to all ARG declarations that are used in FROM statements
• Applied this pattern consistently across 18 Dockerfile configurations

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
dev-support/ranger-docker/Dockerfile.ranger-zk	Added placeholder default for ZK_VERSION
dev-support/ranger-docker/Dockerfile.ranger-usersync	Added placeholder defaults for RANGER_BASE_IMAGE and RANGER_BASE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-trino	Added placeholder default for TRINO_VERSION
dev-support/ranger-docker/Dockerfile.ranger-tagsync	Added placeholder defaults for RANGER_BASE_IMAGE and RANGER_BASE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-sqlserver	Added placeholder default for SQLSERVER_VERSION
dev-support/ranger-docker/Dockerfile.ranger-solr	Added placeholder default for SOLR_VERSION
dev-support/ranger-docker/Dockerfile.ranger-postgres	Added placeholder default for POSTGRES_VERSION
dev-support/ranger-docker/Dockerfile.ranger-ozone	Added placeholder defaults for OZONE_RUNNER_IMAGE and OZONE_RUNNER_VERSION
dev-support/ranger-docker/Dockerfile.ranger-oracle	Added placeholder default for ORACLE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-mysql	Added placeholder default for MARIADB_VERSION
dev-support/ranger-docker/Dockerfile.ranger-knox	Added placeholder defaults for RANGER_BASE_IMAGE and RANGER_BASE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-kms	Added placeholder defaults for RANGER_DB_TYPE, RANGER_BASE_IMAGE, and RANGER_BASE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-kafka	Added placeholder defaults for RANGER_BASE_IMAGE and RANGER_BASE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-hive	Added placeholder defaults for RANGER_BASE_IMAGE and RANGER_BASE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-hbase	Added placeholder defaults for RANGER_BASE_IMAGE and RANGER_BASE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-hadoop	Added placeholder defaults for RANGER_BASE_IMAGE and RANGER_BASE_VERSION
dev-support/ranger-docker/Dockerfile.ranger-build	Added placeholder defaults for RANGER_BASE_IMAGE and RANGER_BASE_BUILD_VERSION
dev-support/ranger-docker/Dockerfile.ranger	Added placeholder defaults for RANGER_DB_TYPE, RANGER_BASE_IMAGE, and RANGER_BASE_VERSION

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