- e2e and checks-backend: enable build-cache restore so they hit the
  seeded gobuild cache.
- pgsql/sqlite/mysql/mssql: replace `make backend` with
  `make generate-go`. Integration tests build their own test binary
  and never invoke the gitea executable; only bindata generation is
  needed.
- unit-tests-gogit: narrow to packages with gogit/nogogit-tagged
  files via a new `test-backend-gogit` Makefile target. Other
  packages produce identical compiled output regardless of the gogit
  tag, so retesting them was busywork.
- cache-seeder: stop the lint job from competing with the gobuild
  job on the shared non-rotated gobuild key.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

The previous commit replaced `make backend` with `make generate-go`
on the assumption that the gitea executable was unused by the
integration tests. It is used: integration tests install git
pre-receive hooks that shell out to the binary, so `git push`
operations during tests fail with "No such file or directory".

Reverts that part of the previous change; the other cache-reuse
tweaks remain.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

Splits each database integration job (pgsql/sqlite/mysql/mssql) into
two parallel matrix shards. Test names are enumerated from the
integration source and partitioned round-robin (~301/302 of 603
tests per shard); names that don't match the shard are filtered out
via -test.run.

Migration tests (~50-90 s, fast, sequential) only run on shard 1.

The original job names (test-pgsql, test-sqlite, test-mysql,
test-mssql) are kept as one-step aggregator jobs that depend on the
shards job and report success only when all shards passed. This
keeps any branch-protection rule referencing those names valid.

Source-based enumeration is used because the test binary's
-test.list calls TestMain, which boots the full Gitea environment
and panics without a configured database.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

- pgsql/sqlite/mysql/mssql: increase shards from 2 to 3, dropping
  per-job wall time from ~13 min to ~9-10 min on the slowest (pgsql).
- test-unit: split into test-unit-bindata and test-unit-gogit running
  in parallel, with a test-unit aggregator preserving the existing
  check name. Each gets its own rotated cache (cache-name unit and
  unit-gogit) so testcache accumulates per variant.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

Rename:
- test-unit-bindata -> test-unit-nogogit. Both jobs run with the
  bindata tag; the meaningful difference is the gogit codepath, and
  the codebase already uses the nogogit/gogit suffix on its
  build-tagged source files.

test-unit-gogit cleanup:
- The gogit-affected package set (modules/git/gitrepo/lfs and direct
  importers) doesn't touch elasticsearch/meilisearch/redis/minio/
  azurite, so drop those services and the matching /etc/hosts step.

Shard runner robustness (Copilot review feedback):
- Validate TEST_SHARD/TEST_TOTAL_SHARDS are positive ints with
  shard in [1, total]; exit 2 on bad input.
- Tighten the test-name grep to require `*testing.T` or `*testing.TB`
  arg, dropping the TestMain false-positive.
- Force LC_ALL=C sort so the partition is deterministic regardless
  of the runner's locale.
- Empty assignment now exits 1 instead of silently passing.

find-gogit-test-pkgs.sh:
- Mirror the Makefile's GO_TEST_PACKAGES exclusions (drop
  models/migrations/..., tests/integration, tests/integration/migration-test).
- Tighten the comment header — the script returns packages WITH TESTS,
  not all callers.
- Drop dead alternatives from the import-match regex.

Makefile test-backend-gogit:
- Fail when the script fails or returns no packages instead of
  silently running `go test` with no args.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

- partition-by-shard.sh: fix off-by-one. `NR % t == r` placed item 1
  in shard `total`, item 2 in shard 1 — shifted by one. Switch to
  `(NR-1) % t == r` so shard 1 owns items 1, 1+t, 1+2t, ... as
  documented.
- test-integration-shard.sh: the `[A-Z]` after `Test` rejected
  `Test_Foo`-style names (28 such tests in tests/integration). Drop
  the [A-Z] and broaden the comment to match the actual regex.
- test-integration-shard.sh: drop `*testing.TB` alternative — there
  are zero matching tests in this codebase, so the simpler regex is
  exact.
- find-gogit-test-pkgs.sh: merge the `grep -vE` exclusion into the
  awk filter. Avoids a pipefail edge case where empty grep output
  would abort the pipeline before the friendly empty-list message
  fires; also one fewer process per invocation.
- Makefile test-integration: fail fast at Make level if TEST_SHARD
  is set without TEST_TOTAL_SHARDS, instead of letting the script's
  ${X:?...} surface a less obvious error.

All locals in the new bash scripts use UPPER_CASE to match the
existing tools/test-e2e.sh convention.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

Revert the cosmetic rename "unit tests (bindata)" / "unit tests (bindata
gogit)" back to "unit-tests" / "unit-tests-gogit" to match main. The
structural change — separate steps with a trailing make test-check —
stays.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

* origin/main:
  chore(deps): update action dependencies (go-gitea#37751)

# Conflicts:
#	.github/workflows/pull-e2e-tests.yml