CI: cherry-pick auto-derive addon requires_mod step from PR 820

[eduralph]

Summary

Cherry-picks c6aa10e0 from feature/ci-cd-pipeline-upstream (= upstream PR gramps-project#820) onto fork's maintenance/gramps60. Adds an "Install addon runtime deps (derived from requires_mod)" pre-test step to all three job that exercises addon code: unit-test-linux, unit-test-windows, integration-test.

This is the third of upstream PR gramps-project#820's five CI commits — the other two (28febdcd shell:bash, 715e71dd OS-split) landed via PR #12. This one wasn't picked at the time because integration-test wasn't running successfully end-to-end yet, so the missing addon deps weren't surfaced.

Now that PR #13 brings in upstream's WebSearch fix (gramps-project#833) and the integration-test step actually exercises TMGimporter's tests/test_integration.py to completion, the missing dbf package surfaces:

For TMG Importer to work please install 'dbf >= 0.99.0' (No module named 'dbf')
setUpClass (TMGimporter.tests.test_integration.TestFullPipelineRelph) ... ERROR
File ".../TMGimporter/libtmg.py", line 521, in map_dbfs_to_tables
    tmgPeople = Table(
NameError: name 'Table' is not defined

dbf is declared in TMGimporter.gpr.py's requires_mod list. Without the auto-derive step, it's never installed.

What the step does

For every */*.gpr.py in the checkout, parses out requires_mod = [...] literals via ast.literal_eval, takes the union, and pip-installs each package one at a time (per-package install so a single failing build — pygraphviz without graphviz-dev, etc. — doesn't abort the rest).

Mirrors Gramps' Addon Manager install path (gramps/gui/plug/_windows.py __on_install_clicked → req.install → gen/utils/requirements.py), keeping .gpr.py files as the single source of truth for addon deps.

Why fork-only

The same fix is already part of upstream PR gramps-project#820 as commit c6aa10e0. Once gramps-project#820 lands upstream, a future fork-resync makes this cherry-pick redundant. No upstream PR needed for this.

Verification

• YAML parses (yaml.safe_load → 7 jobs).
• The "Install addon runtime deps" step now appears in three jobs, each placed BEFORE that job's test-running step:

  L103: unit-test-linux  — install step before  L141: Run per-addon unit tests
  L207: unit-test-windows — install step before  L237: Run per-addon unit tests
  L277: integration-test  — install step before  L309: Run plugin registration tests
  

• Replaying the auto-derive snippet against the local addons-source tree resolves 9 addon deps including dbf:

  boto3, dbf, life_line_chart, litellm, networkx, psycopg,
  psycopg2, pygraphviz, svgwrite
  

• After this lands and PR Sync fork's maintenance/gramps60 with upstream (2026-05-08) #13 merges, the next CI run on maintenance/gramps60 should clear the integration-test step's NameError (dbf will be on the path) and let TestFullPipelineRelph actually run.

Stacking note

This PR is independent of #13 (the upstream-sync PR). They can land in either order; if #13 lands first, integration-test starts working as soon as this lands too. No coordination required.

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