Add support for dynamic tags (#3897)

* Allow creation of dynamic tags

* Extend project factory and related modules to support dynamic values

* Extend folder and organization modules

* project and organization readme

* Simplify dynamic tag support and remove unnecessary restrictions

  • Schemas & Validations: Removed the restriction that forbade combining IAM fields with  allowed_values_regex  on tags. Updated validations in  project  and  organization  modules, and
  simplified all relevant JSON schemas.
  • Module Tag Bindings: Simplified the  tag_value  assignment in  folder ,  project ,  gcs ,  bigquery-dataset , and  kms  modules by removing the defensive  can(regex(...))  check and
  calling  templatestring  directly.
  • Outputs: Removed the  tags_dynamic  output from  project  and  organization  modules, as the same information is now available in  tag_keys .
  • Project Factory: Updated  tag_vars_projects  in  projects.tf  to use the native  namespaced_name  attribute and filtered manually for dynamic tags.

* fix(organization, project): fix linting and tests for dynamic tag support

- Align allowed_values_regex and description extraction in _tags_merged
  locals to use lookup() for consistency with other fields.
- Fix spacing in project context variable (alphabetical ordering).
- Update organization tags test to include the new cost_center tag key
  with allowed_values_regex.
- Update project tags test to include the new cost_center tag key and
  reflect the resolved allowed_values_regex on environment.

* refactor(gcs): refine tag bindings and fix context test

- Add _tag_bindings local to pre-resolve context references, enabling
  templatestring to receive a direct map reference (required by Terraform).
- Use var.context.tag_vars instead of the non-existent local.ctx.tag_vars.
- Fix HCL syntax in context.tfvars (escaped inner quotes).
- Update context test inventory to reflect 3 tag bindings including a
  dynamic value resolved via templatestring.

* refactor: align modules with tag binding context pattern

- Add _tag_bindings local + templatestring dance to cloud-run-v2,
  compute-vm, folder, kms modules (bigquery-dataset already had it)
- Exclude tag_vars from local.ctx in cloud-run-v2, compute-vm, folder,
  kms, project modules (bigquery-dataset already had it)
- Add tag_vars to context variable in cloud-run-v2, compute-vm modules
  (others already had it)
- Update all context tests with dynamic tag binding values using
  var.context.tag_vars

* docs: add module-level tftest.yaml test instructions to GEMINI.md

* docs: regenerate READMEs after tag-regex alignment

- Regenerate variable tables in 7 module READMEs to reflect
  line number shifts from prior tag-regex changes
- Add tag_vars exclusion to gcs ctx local
- Fix whitespace alignment in iam-service-account and
  project-factory tag_vars blocks
- Update tftest resource counts for organization and project
- Remove tags_dynamic from organization/project output tables

* fix(project-factory): update test inventory for tag_bindings module split

- Move tag binding address from folder-2 to folder-2-iam in test
  inventory (tag_bindings moved from creation to IAM modules)
- Update module instance count from 34 to 35
- Regenerate README tables after terraform fmt line shifts
- Apply terraform fmt to variables.tf

* refactor(project-factory): remove unnecessary depends_on from folder-iam modules

Folder IAM modules depend on their own folder creation modules, not
on module.projects. The explicit depends_on was leftover from an
earlier design.

* FAST stages

* Address review comments.

- FAST Stages:
  - Added tag_keys to output-files.tf in 0-org-setup to pass org tags via tfvars.
  - Sorted tag_keys and tag_values in output-files.tf.
  - Updated project-factory, networking, and security stages to use tag_keys.
  - Filtered tag_keys for dynamic tags only.
- Modules:
  - Excluded tag_vars from local.ctx in iam-service-account and organization.
  - Simplified tag_value in iam-service-account.
- Tests:
  - Updated test inventories for 0-org-setup and project-factory.

* Fix tf format

* Fix tfdoc

* docs: add ADR for templatestring vars convention and update status of base path ADR

* More tfdoc

* Update schemas

* Use endswith in context loop

* Address review

* Update FAST readmes

* Update last modules

* Terraform fmt

* Revert alloydb

* Fix whitespace

---------

Co-authored-by: Ludovico Magnocavallo <ludo@qix.it>

modules/agent-engine/main.tf

@@ -29,7 +29,7 @@ locals {
   ctx = {
     for k, v in var.context : k => {
       for kk, vv in v : "${local._ctx_p}${k}:${kk}" => vv
-    } if k != "condition_vars"
+    } if !endswith(k, "_vars")
   }
   location = lookup(
     local.ctx.locations, var.region, var.region