ci: rename test-unit-bindata, simplify and address review comments

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>

.github/workflows/pull-db-tests.yml

@@ -127,7 +127,7 @@ jobs:
     steps:
       - run: '[ "${{ needs.test-sqlite-shards.result }}" = "success" ]'
 
-  test-unit-bindata:
+  test-unit-nogogit:
     if: needs.files-changed.outputs.backend == 'true' || needs.files-changed.outputs.actions == 'true'
     needs: files-changed
     runs-on: ubuntu-latest
@@ -193,40 +193,9 @@ jobs:
     if: needs.files-changed.outputs.backend == 'true' || needs.files-changed.outputs.actions == 'true'
     needs: files-changed
     runs-on: ubuntu-latest
-    services:
-      elasticsearch:
-        image: docker.elastic.co/elasticsearch/elasticsearch:8.19.15
-        env:
-          discovery.type: single-node
-          xpack.security.enabled: false
-        ports:
-          - "9200:9200"
-      meilisearch:
-        image: getmeili/meilisearch:v1
-        env:
-          MEILI_ENV: development # disable auth
-        ports:
-          - "7700:7700"
-      redis:
-        image: redis
-        options: >- # wait until redis has started
-          --health-cmd "redis-cli ping"
-          --health-interval 5s
-          --health-timeout 3s
-          --health-retries 10
-        ports:
-          - 6379:6379
-      minio:
-        image: bitnamilegacy/minio:2021.12.29
-        env:
-          MINIO_ACCESS_KEY: 123456
-          MINIO_SECRET_KEY: 12345678
-        ports:
-          - "9000:9000"
-      devstoreaccount1.azurite.local: # https://github.com/Azure/Azurite/issues/1583
-        image: mcr.microsoft.com/azure-storage/azurite:latest
-        ports:
-          - 10000:10000
+    # the gogit-affected package set (modules/git, modules/gitrepo, modules/lfs and
+    # their direct importers) doesn't touch elasticsearch/meilisearch/redis/minio/
+    # azurite — no services needed.
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
@@ -238,8 +207,6 @@ jobs:
         with:
           cache-name: unit-gogit
           build-cache-rotate: "true"
-      - name: Add hosts to /etc/hosts
-        run: '[ -e "/.dockerenv" ] || [ -e "/run/.containerenv" ] || echo "127.0.0.1 minio devstoreaccount1.azurite.local mysql elasticsearch meilisearch smtpimap" | sudo tee -a /etc/hosts'
       - run: make deps-backend
       - run: make backend
         env:
@@ -254,11 +221,11 @@ jobs:
           GITHUB_READ_TOKEN: ${{ secrets.GITHUB_READ_TOKEN }}
 
   test-unit:
-    needs: [files-changed, test-unit-bindata, test-unit-gogit]
+    needs: [files-changed, test-unit-nogogit, test-unit-gogit]
     if: always() && (needs.files-changed.outputs.backend == 'true' || needs.files-changed.outputs.actions == 'true')
     runs-on: ubuntu-latest
     steps:
-      - run: '[ "${{ needs.test-unit-bindata.result }}" = "success" ] && [ "${{ needs.test-unit-gogit.result }}" = "success" ]'
+      - run: '[ "${{ needs.test-unit-nogogit.result }}" = "success" ] && [ "${{ needs.test-unit-gogit.result }}" = "success" ]'
 
   test-mysql-shards:
     if: needs.files-changed.outputs.backend == 'true' || needs.files-changed.outputs.actions == 'true'