Optimize mt-check-data-outdated.yml — eliminate setup overhead

[Copilot]

The workflow was spending ~90% of its runtime on MT setup (JDK 17, Gradle, submodule checkout) and installing libxml2-utils just to read two timestamp values from XML files. Since this runs almost daily, the cost was significant.

Changes

• Remove MT setup step — JDK, Gradle, and submodule initialization are not needed to read XML timestamps
• Minimal checkout — submodules: true + fetch-depth: 0 → fetch-depth: 1 (shallow, no submodules)
• Inline check logic — data-outdated logic moved directly into the workflow step, eliminating the dependency on agency-parser/check_data_outdated.sh
• Replace xmllint with grep — no package install required; timestamps extracted using built-in tools:

  grep -oE 'name="next_gtfs_rts_last_departure_in_sec">[0-9]+' "${NEXT_VALUES}" | grep -oE '[0-9]+'

• Reduce timeout — 20 min → 5 min
• Remove unused env vars — stripped workflow-level vars that only existed to support the removed setup action
• Add timestamp validation — regex guard against malformed XML before arithmetic comparisons

Original prompt

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This section details on the original issue you should resolve

<issue_title>mt-check-data-outdated.yml > takes too long</issue_title>
<issue_description>shared-overwrite/.github/workflows/mt-check-data-outdated.yml

we need to read the times from app-android/res-*/values*_gtfs_rts_values_gen.xml files directly instead of having to use ./.github/actions/setup and then agency-parser/check_data_outdated.sh which represents 90% of the workflow run duration.

Also would try to use Github Linux runners built in tools (grep, sed...) instead of having to install "libxml2-utils" package to use "xmllint".
Like we were doing here:

commons/shared-opt-dir/agency-parser/check_data_outdated.sh

Line 33 in 23b210f

grep -E "<integer name=\"[^\"]*_gtfs_rts_last_departure_in_sec\">[0-9]+</integer>" "$FILE" 2>/dev/null | sed 's/[^[:digit:]]*\([[:digit:]]\+\).*/\1/' || echo "";

Let's make this workflow as fast as possible since it's meant to run (almost) daily.

For example: actions/checkout should only load the minimum amount of data.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes mt-check-data-outdated.yml > takes too long #627

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