added container network feature to build (#142)

Author: ddsharpe

imagetool/src/main/java/com/oracle/weblogic/imagetool/cli/menu/CommonOptions.java

@@ -114,6 +114,10 @@ DockerBuildCommand getInitialBuildCmd(String contextFolder) {
 
         cmdBuilder.setTag(imageTag);
 
+        if (!Utils.isEmptyString(buildNetwork)) {
+            cmdBuilder.addNetworkArg(buildNetwork);
+        }
+
         if (!Utils.isEmptyString(httpProxyUrl)) {
             cmdBuilder.addBuildArg("http_proxy", httpProxyUrl);
         }
@@ -388,13 +392,19 @@ String getPassword() {
     )
     List<String> patches = new ArrayList<>();
 
-
     @Option(
         names = {"--opatchBugNumber"},
         description = "the patch number for OPatch (patching OPatch)"
     )
     String opatchBugNumber = "28186730_13.9.4.2.2";
 
+    @Option(
+        names = {"--buildNetwork"},
+        description = "Set the networking mode for the RUN instructions during build"
+    )
+    String buildNetwork;
+
+    @SuppressWarnings("unused")
     @Unmatched
     List<String> unmatchedOptions;
 }

imagetool/src/main/java/com/oracle/weblogic/imagetool/util/DockerBuildCommand.java

@@ -74,6 +74,15 @@ public void addBuildArg(String key, String value, boolean conceal) {
         buildArgs.add(arg);
     }
 
+    /**
+     * Add a --network to the Docker build command.
+     * @param value the Docker network to use
+     */
+    public void addNetworkArg(String value) {
+        command.add("--network");
+        command.add(value);
+    }
+
     /**
      * Executes the given docker command and writes the process stdout to log.
      *