Artigo original: https://www.novatec-gmbh.de/en/blog/spring-boot-applications-tls-http2/
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Criando certificado raiz
keytool -genkeypair -alias root-ca -keyalg RSA -keysize 3072 -ext BC:c=ca:true -keystore ./root-ca/ca.jks -storepass secret -keypass secret
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Exportando o certificado raiz
keytool -exportcert -alias root-ca -keystore ./root-ca/ca.jks -rfc -file ./root-ca/ca.pem -storepass secret