Edited .env

.env.example

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+# Project / DB names used by both emulator bootstrap and your Go app
+SPANNER_PROJECT=test-project
+SPANNER_INSTANCE=testinstance
+SPANNER_DATABASE=testdb
+
+# When your Go app runs on the HOST (Mac/Windows/Linux):
+SPANNER_EMULATOR_HOST=localhost:9010
+
+# When your Go app runs INSIDE docker-compose:
+SPANNER_EMULATOR_HOST_DOCKER=spanner:9010