Add docker support

docker-executor/build.gradle

@@ -0,0 +1,22 @@
+apply plugin: 'docker'
+
+group 'com.devsoap'
+
+dependencies {
+    compile project(':dbt-core')
+    runtime ratpack.dependency('h2')
+    runtime ratpack.dependency('jdbc-tx')
+    runtime 'org.slf4j:slf4j-simple:1.7.25'
+}
+
+run {
+    environment('RATPACK_DBT__LEDGER__REMOTE_URL', findProperty('ledgerURL').toString() ?: "http://localhost:5050/ledger")
+    environment('RATPACK_DBT__LEDGER__ENABLED', false)
+}
+
+distDocker {
+    registry = findProperty('dockerRegistry')
+    tagVersion = 'latest'
+    exposePort 5050
+    run.environment.each {key,value -> setEnvironment(key.toString(), value.toString())}
+}

docker-executor/src/ratpack/Ratpack.groovy

@@ -0,0 +1,24 @@
+import com.devsoap.dbt.DBTModule
+import org.h2.jdbcx.JdbcDataSource
+import org.slf4j.LoggerFactory
+
+import javax.sql.DataSource
+
+import static ratpack.groovy.Groovy.ratpack
+
+def log = LoggerFactory.getLogger('dbt-executor')
+
+ratpack {
+    serverConfig {
+        env()
+        sysProps()
+    }
+
+    bindings {
+        bindInstance(DataSource, new JdbcDataSource(url: 'jdbc:h2:mem:dbtdb;DB_CLOSE_DELAY=-1', user: ''))
+        module (DBTModule)  { config ->
+            log.info "Executor available at $config.executor.remoteUrl"
+            log.info "Ledger available at $config.ledger.remoteUrl"
+        }
+    }
+}