feat(#577): Release github workflow - deloy to maven central reposirory

[triskill]

closes #577

[gemini-code-assist]

Code Review

This pull request migrates the project's group ID and packages from org.zenbpm to org.pbinitiative and prepares the library for publishing to Maven Central (version 1.3.0) by adding required POM metadata, GPG signing, and the Sonatype Central publishing plugin. Additionally, the OpenAPI specification (api.yaml) has been extensively updated to introduce several new REST endpoints and query parameters, including support for decision instances, process definition statistics, event subscriptions, variable management, and enhanced job operations. No review comments were provided, so there is no additional feedback to address.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.

[triskill]

/gemini review

[gemini-code-assist]

Code Review

This pull request migrates the project's package namespace from org.zenbpm to org.pbinitiative, updates the version to 1.3.0, and significantly expands the OpenAPI specification to support new endpoints for decision instances, process definition statistics, variable management, child processes, event subscriptions, and job management. The review feedback highlights several discrepancies in the OpenAPI specification where schemas (such as DecisionInstanceSummary, DecisionInstanceDetail, and ProcessDefinitionStatistics) or response examples are missing required fields or properties present in the examples, which could lead to client generation or validation issues.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.