added docker hub hook for multi-platform build

Author: mlodic

docker/hooks/build

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+echo "display path"
+echo "$(pwd)"
+echo "display dockerfile path"
+echo $DOCKERFILE_PATH
+cd ..
+echo "display path"
+echo "$(pwd)"
+echo "current branch"
+echo "$SOURCE_BRANCH"
+
+version_regex='^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$'
+if [[ "$SOURCE_BRANCH" == "master" || "$SOURCE_BRANCH" =~ $version_regex ]]; then
+  echo "The branch is master, proceeding with multi-arch build"
+  docker buildx create --name multiarch --use
+  docker buildx build -f "$DOCKERFILE_PATH" -t "$IMAGE_NAME" --platform linux/arm64,linux/amd64 --push .
+else
+  echo "The branch is not master, proceeding with classic build"
+  docker buildx build -f "$DOCKERFILE_PATH" -t "$IMAGE_NAME" --push .
+fi

docker/hooks/post_push

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+if [[ "$SOURCE_BRANCH" == "master" ]]; then
+  curl -d "text=A new production image has been pushed to Docker Hub" -d "channel=$SLACK_CHANNEL" -H "Authorization: Bearer $SLACK_TOKEN" -X POST https://slack.com/api/chat.postMessage
+fi