feat(yaml): Add Pub/Sub to Iceberg YAML template

[ihebimad]

Successful job ID: 2026-07-13_01_45_58-10276467203691830168

[gemini-code-assist]

Summary of Changes

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This pull request introduces a new YAML-based Dataflow template for streaming data from Google Cloud Pub/Sub to Apache Iceberg. It includes all required infrastructure, such as the template definition, documentation, and an integration test, to support this new pipeline capability.

Highlights

• New YAML Template: Added a new Pub/Sub to Iceberg YAML template to enable streaming data ingestion from Pub/Sub to Apache Iceberg tables.
• Configuration and Documentation: Included the necessary YAML configuration files, documentation, and Java interface definition for the new template.
• Integration Testing: Added a new integration test class to verify the functionality of the Pub/Sub to Iceberg YAML template.

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[gemini-code-assist]

Code Review

This pull request introduces a new Pub/Sub to Iceberg (YAML) template, including its documentation, Java interface definition, YAML template, and integration tests. The review feedback highlights syntax errors in the YAML template where Java array initializer syntax was incorrectly used for 'filesToCopy' and 'requirements' instead of standard YAML lists. Additionally, the reviewer recommends making the 'topic' and 'schema' parameters optional in the Java interface to support reading from subscriptions and handling RAW or STRING formats without requiring a schema.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.09%. Comparing base (1608d1d) to head (fc15ef4).
⚠️ Report is 4 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (1608d1d) and HEAD (fc15ef4). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (1608d1d)	HEAD (fc15ef4)
	6	1

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #4020       +/-   ##
=============================================
- Coverage     55.70%   38.09%   -17.61%     
+ Complexity     7236      511     -6725     
=============================================
  Files          1124      195      -929     
  Lines         68447    11759    -56688     
  Branches       7721     1176     -6545     
=============================================
- Hits          38127     4480    -33647     
+ Misses        27846     6914    -20932     
+ Partials       2474      365     -2109     

Components	Coverage Δ
spanner-templates	∅ <ø> (∅)
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	∅ <ø> (∅)
spanner-live-reverse-replication	∅ <ø> (∅)
spanner-bulk-migration	∅ <ø> (∅)
gcs-spanner-dv	∅ <ø> (∅)
see 954 files with indirect coverage changes

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