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upstream(mattermost-lts): refresh to 11.7.6 ESR; correct survey's 10.x-LTS misread

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| postgres | postgres | https://github.com/postgres/postgres | https://www.postgresql.org/docs/release/ |
## Standing notes
- mattermost-lts tracks the **11.7 ESR (Extended Support Release)**. Release calendar:
- **10.11** = previous ESR, expires **2026-08-15** — migrated away 2026-06-19
- **11.7** = current ESR, supported through **2027-05-15**; latest patch: **11.7.5** (2026-06-18)
- mattermost-lts tracks the **11.7 ESR (Extended Support Release)** = Mattermost's LTS line. The "LTS"
concept in Mattermost is **ESR**; there is NO "10.x LTS line". Release calendar (endoflife.date/mattermost):
- **10.11** = previous ESR, security support **ends 2026-08-15** (~7 weeks) — migrated away 2026-06-19
- **11.7** = current ESR, supported through **2027-05-15** (~11 months); latest patch: **11.7.6** (2026-06-25)
- **11.8.x** = innovation release (3-month lifecycle, EOL 2026-09-15) — do NOT target
- **10.12** = innovation release, support **EXPIRED December 2025** — do NOT target
- **10.12** = innovation release, support **EXPIRED 2025-12-15** (do NOT target, despite abra listing 10.12.4)
- Check the release lifecycle at https://endoflife.date/mattermost before each upgrade run.
- Next ESR after 11.7 expected ~February 2027 (9-month cadence)
The `release-11.7` Docker Hub floating tag always points to the latest 11.7.x patch.
IMPORTANT: Do NOT use 11.7.0–11.7.2 — they have a schemeid migration bug in the `roles` table
when upgrading from 10.11.17+; use 11.7.3 or later (current: 11.7.5).
- **2026-06-22 re-check** (endoflife.date/mattermost, data 2026-06-19): 11.7.5 is STILL the
newest 11.7.x patch (released 2026-06-18); 10.11 ESR security support ends 2026-08-15
(~2 months); 10.12 innovation ENDED 2025-12-15 (do NOT target, despite abra listing 10.12.4);
11.8 innovation EOL 2026-09-15. PR #2 (11.7.5 + restore fix) remains the correct, current
upgrade — this run is a confirmation re-verification, not a re-bump.
when upgrading from 10.11.17+; use 11.7.3 or later (current: 11.7.6).
- **2026-06-26 re-check** (endoflife.date/mattermost, data 2026-06-27): **11.7.6** released
2026-06-25 (Low–Medium security fixes, no breaking changes / no migrations) is the newest 11.7.x
patch — REFRESH target from 11.7.5 → 11.7.6. 10.11 ESR security support ends 2026-08-15 (~7 weeks);
10.12 innovation ENDED 2025-12-15 (do NOT target, despite the survey listing 10.12.4); 11.8
innovation EOL 2026-09-15. GitHub release: https://github.com/mattermost/mattermost/releases/tag/v11.7.6
- **Survey-correction log:** the 2026-06-26 orchestrator survey claimed "10.x is LTS, target
10.12.4, 11.x is non-LTS". **That is incorrect** — Mattermost has no "10.x LTS line"; the LTS
concept is ESR, the ESR line jumped 10.11 → 11.7 in May 2026, and 10.12 is an EXPIRED innovation
release. Both the 2026-06-19 and 2026-06-22 runs correctly identified 11.7 ESR as the LTS target;
this run re-confirms it. The survey's recommendation would have regressed the recipe onto an
unsupported branch — DO NOT follow it.
- postgres: stay on **15-alpine** for now. The upgrade to 16-alpine requires a major-version migration
(pg_upgrade or dump/restore with operator involvement) because the stack runs with a persistent
postgres_data volume. A 16 container against pg15 PGDATA crashes on startup. Major pg bump is a