add new path to possible docker exe locations in Windows (#25)

Author: jorgenota

README.md

@@ -77,6 +77,10 @@ You can configure the Docker behaviour using the `@LocalstackDockerProperties` a
 
 For more details, please refer to the README of the main LocalStack repo: https://github.com/localstack/localstack
 
+> **_NOTE:_** These utilities assume docker is installed in one of the default locations (`C:\program files\docker\docker\resources\bin\docker.exe`,
+`C:\program files\docker\docker\resources\docker.exe`, `usr/local/bin/docker` or `usr/bin/docker`). If your docker executable is in a
+different location, then use the `DOCKER_LOCATION` environment variable to specify it.
+
 ### Deprecated Configurations
 
 Due to recent changes in LocalStack (e.g., exposing all services via a single edge port, `4566`), the following configuration parameters are now deprecated in the latest version:

src/main/java/cloud/localstack/LocalstackTestRunner.java

@@ -11,8 +11,8 @@
  * and then terminates when tests are complete.
  *
  * Having docker installed is a prerequisite for this test runner to execute.  If docker
- * is not installed in one of the default locations (C:\program files\docker\docker\resources\bin\, usr/local/bin or
- * usr/bin)
+ * is not installed in one of the default locations (C:\program files\docker\docker\resources\bin\docker.exe,
+ * C:\program files\docker\docker\resources\docker.exe, usr/local/bin/docker or usr/bin/docker)
  * then use the DOCKER_LOCATION environment variable to specify the location.
  *
  * Since ports are dynamically allocated, the external port needs to be resolved based on the default localstack port.

src/main/java/cloud/localstack/docker/DockerExe.java

@@ -26,6 +26,7 @@ public class DockerExe {
     private static final List<String> POSSIBLE_EXE_LOCATIONS = Arrays.asList(
             System.getenv("DOCKER_LOCATION"),
             "C:/program files/docker/docker/resources/bin/docker.exe",
+            "C:/program files/docker/docker/resources/docker.exe",
             "/usr/local/bin/docker",
             "/usr/bin/docker");
 

src/main/java/cloud/localstack/docker/LocalstackDockerExtension.java

@@ -11,8 +11,8 @@
  * and then terminates when tests are complete.
  *
  * Having docker installed is a prerequisite for this test runner to execute.  If docker
- * is not installed in one of the default locations (C:\program files\docker\docker\resources\bin\, usr/local/bin or
- * usr/bin)
+ * is not installed in one of the default locations (C:\program files\docker\docker\resources\bin\docker.exe,
+ * C:\program files\docker\docker\resources\docker.exe, usr/local/bin/docker or usr/bin/docker)
  * then use the DOCKER_LOCATION environment variable to specify the location.
  *
  * Since ports are dynamically allocated, the external port needs to be resolved based on the default localstack port.