feat: add mavenDebugOutput option for logging raw Maven command output

[z4ce]

Introduced mavenDebugOutput boolean option to enable logging of raw Maven command output during execution.

• Ready for review
• Follows CONTRIBUTING rules
• Reviewed by Snyk internal team

What does this PR do?

Introduces a new flag (mavenDebugOutput) to print maven stdout/stderr with snyk --debug is being used.

I created this after debugging an issue with maven caching. It was hard to tell if snyk was caching the output or not.It's not possible to tell if caching is being used right now without running maven commands by hand which can be difficult in CI situations. This is what the output looks like:

2026-03-25T03:39:51.878Z snyk-mvn-plugin Child process exited with code: 0
2026-03-25T03:39:51.878Z snyk-mvn-plugin Maven version: Apache Maven 3.9.12 (848fbb4bf2d427b72bdb2471c22fced7ebd9a7a1), explicit plugin version: 3.9.0
2026-03-25T03:39:51.879Z snyk-mvn-plugin Maven command: mvn dependency:tree -DoutputType=dot --batch-mode --non-recursive --file pom.xml
2026-03-25T03:39:51.879Z snyk-mvn-plugin Maven working directory: /Users/ianzink/git/maven-monorepo-example
2026-03-25T03:39:51.879Z snyk-mvn-plugin Verbose enabled: false
2026-03-25T03:39:53.583Z snyk-mvn-plugin Child process exited with code: 0
2026-03-25T03:39:53.583Z snyk-mvn-plugin >>> Maven dependency:tree output (mvn dependency:tree -DoutputType=dot --batch-mode --non-recursive --file pom.xml):
2026-03-25T03:39:53.583Z snyk-mvn-plugin [INFO] Scanning for projects...
[INFO]
[INFO] -----------------< org.example:maven-monorepo-example >-----------------
[INFO] Building maven-monorepo-example 1.0-SNAPSHOT
[INFO]   from pom.xml
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] --- dependency:3.3.0:tree (default-cli) @ maven-monorepo-example ---
[INFO] digraph "org.example:maven-monorepo-example:pom:1.0-SNAPSHOT" {
[INFO]  }
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.776 s
[INFO] Finished at: 2026-03-25T14:39:53+11:00
[INFO] ------------------------------------------------------------------------

2026-03-25T03:39:53.583Z snyk-mvn-plugin Metaversions detected: false
2026-03-25T03:39:53.583Z snyk-mvn-plugin No metaversions detected - using no-op resolver for optimal performance

Where should the reviewer start?

How should this be manually tested?

Run snyk test --mavenDebugOutput --debug see the maven output displayed.

Any background context you want to provide?

What are the relevant tickets?

Screenshots

Additional questions

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[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

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