Docker buildx setup for multiple architectures

docker/dockerfiles/build.sh

@@ -10,27 +10,52 @@ if [[ $version == v* ]]; then
     version="${version:1}"
 fi
 
+push=""
+if [ -z "$2" ] || [ "$2" == "--push" ]; then
+    push="$2"
+    if [ ! -z "$push" ]; then
+        echo "Running with $push !"
+    fi
+else
+    echo "Don't understand second argument: $2"
+    exit 1
+fi
+
+if ! docker buildx version > /dev/null; then
+    echo "The docker buildx command is required."
+    echo "See: https://github.com/docker/buildx#binary-release"
+    exit 1
+fi
+
 set -e
 cd "$(dirname "$0")"
 
+trap "{ docker buildx rm docspell-builder; }" EXIT
+
+platforms="linux/amd64,linux/aarch64,linux/arm/v7"
+docker buildx create --name docspell-builder --use
+
 if [[ $version == *SNAPSHOT* ]]; then
     echo ">>>> Building nightly images for $version <<<<<"
     url_base="https://github.com/eikek/docspell/releases/download/nightly"
 
     echo "============ Building Tools ============"
-    docker build \
+    docker buildx build \
+           --platform="$platforms" $push \
            --build-arg tools_url="$url_base/docspell-tools-$version.zip" \
            --tag docspell/tools:nightly \
            -f tools.dockerfile .
 
     echo "============ Building Restserver ============"
-    docker build \
+    docker buildx build \
+           --platform="$platforms" $push \
            --build-arg restserver_url="$url_base/docspell-restserver-$version.zip" \
            --tag docspell/restserver:nightly \
            -f restserver.dockerfile .
 
     echo "============ Building Joex ============"
-    docker build \
+    docker buildx build \
+           --platform="$platforms" $push \
            --build-arg joex_url="$url_base/docspell-joex-$version.zip" \
            --tag docspell/joex:nightly \
            -f joex.dockerfile .
@@ -38,6 +63,7 @@ else
     echo ">>>> Building release images for $version <<<<<"
     echo "============ Building Tools ============"
     docker build \
+           --platform="$platforms" $push \
            --build-arg version=$version \
            --tag docspell/tools:v$version \
            --tag docspell/tools:latest \
@@ -45,6 +71,7 @@ else
 
     echo "============ Building Restserver ============"
     docker build \
+           --platform="$platforms" $push \
            --build-arg version=$version \
            --tag docspell/restserver:v$version \
            --tag docspell/restserver:latest \
@@ -52,6 +79,7 @@ else
 
     echo "============ Building Joex ============"
     docker build \
+           --platform="$platforms" $push \
            --build-arg version=$version \
            --tag docspell/joex:v$version \
            --tag docspell/joex:latest \