A senha do usuário 'alura' está errada na imagem do container fornecida para a aula:
psql -h localhost -d logsdb -U alura
Password for user alura:
psql: error: connection to server at "localhost" (127.0.0.1), port 5432 failed: FATAL: password authentication failed for user "alura"
connection to server at "localhost" (127.0.0.1), port 5432 failed: FATAL: password authentication failed for user "alura"
No código está esta senha errada:
# postgres
spring.datasource.url=jdbc:postgresql://${SPRING_DATASOURCE_URL:localhost}:5432/logsdb
spring.jpa.hibernate.ddl-auto=update
spring.datasource.platform=postgres
spring.datasource.username=alura
spring.datasource.password=nJ6vsW37rCd1v88
