[ITB-2096] Control connection pool configuration properties via environment variables

Author: costas80

gitb-ui/conf/application.conf

@@ -237,6 +237,15 @@ db.default.migration.auto=true
 # Disabling migration validation because the current Flyway version in use is dependent on line feed characters that could lead to false positives.
 db.default.migration.validateOnMigrate=false
 db.default.migration.table="schema_version"
+# Connection pooling properties
+slick.dbs.default.db.numThreads = 20
+slick.dbs.default.db.numThreads = ${?DB_DEFAULT_POOL_THREADS}
+slick.dbs.default.db.maximumPoolSize = 20
+slick.dbs.default.db.maximumPoolSize = ${?DB_DEFAULT_POOL_MAXIMUM_POOL_SIZE}
+slick.dbs.default.db.minimumIdle = 20
+slick.dbs.default.db.minimumIdle = ${?DB_DEFAULT_POOL_MINIMUM_IDLE}
+slick.dbs.default.db.maxLifetime = 1800000
+slick.dbs.default.db.maxLifetime = ${?DB_DEFAULT_POOL_MAX_LIFETIME}
 
 # Latest DB baseline to apply
 latestDbBaselineScript=B124__Release_v1.28.0.sql