[Sync] Update project files from source repository (eec0e19)

[mrz1836]

What Changed

• Updated .dockerignore to exclude dist/ directory but explicitly include !dist/linux/ subdirectory
• Upgraded actions/setup-go action from version v6.3.0 (commit 4b73464bb391d4059bd26b0524d20df3927bd417) to v6.4.0 (commit 4a3601121dd01d1626a1e23e37211e3254c1c06c)
• Added clarifying comments in setup-go-with-cache/action.yml noting that actions/cache handles both restore and save operations
• Updated MAGE_X_VERSION from v1.20.11 to v1.20.15 in .github/env/10-mage-x.env
• Modified MAGE_X_GITLEAKS_VERSION from 8.30.0 (diff shows partial change, specific new version truncated)

Why It Was Necessary

• Bumping mage-x version ensures the project benefits from latest tooling improvements and bug fixes
• Including the dist/linux/ directory in Docker builds allows Linux-specific binaries to be packaged while excluding other distribution artifacts
• Upgrading the setup-go GitHub Action incorporates latest improvements and security patches from the upstream action

Testing Performed

• Verify Docker builds correctly include dist/linux/ contents while excluding other dist/ artifacts
• Confirm GitHub Actions workflows execute successfully with updated action versions
• Validate mage-x v1.20.15 functions correctly in CI/CD pipeline

Impact / Risk

• Low Risk: Version bumps are incremental updates to stable tooling versions
• Docker Build Changes: Modified .dockerignore may affect which files are included in Docker context - verify expected artifacts are present
• CI/CD: GitHub Actions changes should be backwards compatible but monitor initial workflow runs for any unexpected behavior

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mrz1836]

LGTM!