feat(core): add a purge task (#742)

close #737

jdbc-postgres/src/test/java/io/kestra/repository/postgres/PostgresExecutionServiceTest.java

@@ -0,0 +1,20 @@
+package io.kestra.repository.postgres;
+
+import io.kestra.core.repositories.AbstractExecutionServiceTest;
+import io.kestra.jdbc.JdbcTestUtils;
+import jakarta.inject.Inject;
+import org.junit.jupiter.api.BeforeEach;
+
+import java.io.IOException;
+import java.net.URISyntaxException;
+
+class PostgresExecutionServiceTest extends AbstractExecutionServiceTest {
+    @Inject
+    JdbcTestUtils jdbcTestUtils;
+
+    @BeforeEach
+    protected void init() throws IOException, URISyntaxException {
+        jdbcTestUtils.drop();
+        jdbcTestUtils.migrate();
+    }
+}