Flyway didn't works using fast-jar

[loicmathieu]

Describe the bug
Flyway didn't work using the new fast-jar functionality.

When using the following config property

quarkus.package.type=fast-jar

Flyway generates a WARNING :

WARN  [org.fly.cor.int.sca.cla.ClassPathScanner] (main) Unable to resolve location classpath:db/migration. Note this warning will become an error in Flyway 7.

Expected behavior
As with the normal Quarkus runner JAR, Flyway should find and execute the migration scripts.

Actual behavior
Flyway didn't find the migration files inside the classpath.
They are located inside src/main/resources/db/migration.

WARN  [org.fly.cor.int.sca.cla.ClassPathScanner] (main) Unable to resolve location classpath:db/migration. Note this warning will become an error in Flyway 7.

Configuration

# Add your application.properties here, if applicable.
quarkus.package.type=fast-jar

Environment (please complete the following information):

• Output of uname -a or ver: Linux 5.4.0-29-generic testing #33-Ubuntu SMP Wed Apr 29 14:32:27 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
• Output of java -version: openjdk version "11.0.5" 2019-10-15
• Quarkus version or git rev: 1.5.0.CR1
• Build tool (ie. output of mvnw --version or gradlew --version):Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)