ci(tenant-registry): drop store from go-test, keep it in -coverpkg

go: no such tool 'covdata' fires when go test tries to build a test
binary for a package with zero _test.go files under -coverpkg. The
store package has no tests of its own (exercised via the server
harness); excluding it from the test command sidesteps the error
while -coverpkg still counts its coverage from server-side exercise.

Refs: M4.2

.gitea/workflows/ci.yaml

@@ -77,12 +77,13 @@ jobs:
         with: { version: v2.12.2 }
 
       - name: test
-        # Coverage scoped to ./internal/... — cmd/server is the entrypoint
-        # with signal-handling + bind that isn't worth unit-testing.
-        # -coverpkg lets the server tests count their exercise of store/* —
-        # store has no test files because every method is exercised end-to-end
-        # via the server's eachStore harness against both Memory and Postgres.
-        run: go test -race -coverpkg=./internal/... -coverprofile=cover.out ./internal/...
+        # Test runs the packages that HAVE test files (server, config). The
+        # store package is exercised end-to-end via the server's eachStore
+        # harness against both Memory and Postgres, so we don't need its
+        # own test binary — and including it triggers a covdata-tool error
+        # on packages with no _test.go files. -coverpkg makes the server's
+        # exercise of store/* count toward coverage.
+        run: go test -race -coverpkg=./internal/... -coverprofile=cover.out ./internal/server/... ./internal/config/...
 
       - name: coverage gate
         run: |