feat: dc ps --services called only once (#382)

Avoid multiple calls dc ps --services calls. The result of the call
is used to check presence of service.

Author: jansyk13

src/main/groovy/com/avast/gradle/dockercompose/ComposeExecutor.groovy

@@ -130,15 +130,20 @@ abstract class ComposeExecutor implements BuildService<Parameters>, AutoCloseabl
         cachedVersion = VersionNumber.parse(rawVersion.startsWith('v') ? rawVersion.substring(1) : rawVersion)
     }
 
-    Iterable<String> getContainerIds(String serviceName) {
+    Map<String,Iterable<String>> getContainerIds(List<String> serviceNames) {
         // `docker-compose ps -q serviceName` returns an exit code of 1 when the service
         // doesn't exist.  To guard against this, check the service list first.
         def services = execute('ps', '--services').readLines()
-        if (services.contains(serviceName)) {
-            return execute('ps', '-q', serviceName).readLines()
+        def result = [:]
+        for (String serviceName: serviceNames) {
+            if (services.contains(serviceName)) {
+                def containerIds  = execute('ps', '-q', serviceName).readLines()
+                result[serviceName] = containerIds
+            } else {
+                result[serviceName] = []
+            }
         }
-
-        return []
+        return result
     }
 
     private Set<WeakReference<Thread>> threadsToInterruptOnClose = ConcurrentHashMap.newKeySet()

src/main/groovy/com/avast/gradle/dockercompose/tasks/ComposeUp.groovy

@@ -215,7 +215,7 @@ abstract class ComposeUp extends DefaultTask {
 
     protected Iterable<ServiceInfo> loadServicesInfo(Iterable<String> servicesNames) {
         // this code is little bit complicated - the aim is to execute `docker inspect` just once (for all the containers)
-        Map<String, Iterable<String>> serviceToContainersIds = servicesNames.collectEntries { [(it) : composeExecutor.get().getContainerIds(it)] }
+        Map<String, Iterable<String>> serviceToContainersIds = composeExecutor.get().getContainerIds(servicesNames)
         Map<String, Map<String, Object>> inspections = dockerExecutor.getInspections(*serviceToContainersIds.values().flatten().unique())
         serviceToContainersIds.collect { pair -> new ServiceInfo(name: pair.key, containerInfos: pair.value.collect { createContainerInfo(inspections.get(it), pair.key) }.collectEntries { [(it.instanceName): it] } ) }
     }