Added script for image creation and publish

.github/build-and-upload.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+git clone https://github.com/graphhopper/graphhopper.git
+cd graphhopper
+curl -L https://raw.githubusercontent.com/IsraelHikingMap/graphhopper-docker-image-push/main/Dockerfile > Dockerfile
+docker build . -t israelhikingmap/graphhopper:latest
+docker login --username $DOCKERHUB_USER --password $DOCKERHUB_TOKEN
+docker push israelhikingmap/graphhopper:latest
+
+TAG=`git for-each-ref --sort=committerdate refs/tags | tail -n 1 | cut -d "/" -f3`
+if docker manifest inspect israelhikingmap/graphhopper:$TAG >/dev/null; then 
+    echo "No need to publish existing version: $TAG";
+else
+    mv Dockerfile ../Dockerfile
+    git checkout tags/$TAG
+    mv ../Dockerfile Dockerfile
+    docker build . -t israelhikingmap/graphhopper:$TAG
+    docker push israelhikingmap/graphhopper:$TAG
+fi
+
+