Install buildx in koordinator build

Author: nicolaserny

koordinator-build/Dockerfile

@@ -48,7 +48,7 @@ RUN npm install npm@$NPM_VERSION -g
 # Install Docker
 
 RUN set -ex \
-    && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/x86_64/ | grep -o -e 'docker-[.0-9]*-ce\.tgz' | sort -r | head -n 1) \
+    && export DOCKER_VERSION=$(curl --silent --fail --retry 3 https://download.docker.com/linux/static/stable/x86_64/ | grep -o -e 'docker-[.0-9]*\.tgz' | sort -r | head -n 1) \
     && DOCKER_URL="https://download.docker.com/linux/static/stable/x86_64/${DOCKER_VERSION}" \
     && echo Docker URL: $DOCKER_URL \
     && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \
@@ -57,7 +57,15 @@ RUN set -ex \
     && mv /tmp/docker/* /usr/bin \
     && rm -rf /tmp/docker /tmp/docker.tgz \
     && which docker \
-    && (docker version || true)
+    && (docker version || true) \
+    && mkdir -vp ~/.docker/cli-plugins/ \
+    && curl --silent -L --output ~/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/v0.8.2/buildx-v0.8.2.linux-amd64 \
+    && chmod a+x ~/.docker/cli-plugins/docker-buildx \
+    && docker buildx install \
+    && docker buildx version \
+    && docker run --privileged --rm tonistiigi/binfmt --install all \
+    && docker context create xbuilder \
+    && docker buildx create xbuilder --name xbuilder --use 
 
 # Install Dotnet Core
 
@@ -69,7 +77,7 @@ RUN chown root:root /etc/apt/trusted.gpg.d/microsoft.asc.gpg
 RUN chown root:root /etc/apt/sources.list.d/microsoft-prod.list
 RUN apt-get -q update && \
     apt-get install -y \
-        dotnet-sdk-5.0
+    dotnet-sdk-5.0
 
 # Add SSL certificates