Added scripts/docker-build.sh for building docker images in CI

scripts/docker-build.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
+if [ $? -ne 0 ]; then
+  echo "docker login failed."
+  exit 1
+fi
+
+docker build -t "$DOCKER_REPOSITORY/$DOCKER_IMAGE_NAME:$DOCKER_TAG" .
+if [ $? -ne 0 ]; then
+  echo "docker build failed."
+  exit 1
+fi
+
+docker push "$DOCKER_REPOSITORY/$DOCKER_IMAGE_NAME:$DOCKER_TAG"
+if [ $? -ne 0 ]; then
+  echo "docker push failed."
+  exit 1
+fi
+
+exit 0