Multiarch release (#1929)

* Adding release script for multiarch

Signed-off-by: Harsh Thakur <harshthakur9030@gmail.com>

* Comment on buildx

Signed-off-by: Harsh Thakur <harshthakur9030@gmail.com>

* Remove need of triggering buildx script explicitly in build

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

Co-authored-by: Sanket Sudake <sanketsudake@gmail.com>

hack/buildx.sh

@@ -0,0 +1,26 @@
+set -e
+## This script needs to be run to start the emulator for multiarch builds
+create_docker_builder() {
+    if ! $(docker buildx inspect --bootstrap | grep "^Driver" | grep -q "docker-container"); then
+        echo "Starting docker builder fission"
+        docker buildx create --name=fission --use --driver=docker-container
+        docker buildx inspect --bootstrap
+    fi
+}
+
+check_platform() {
+    if ! $(docker buildx inspect --bootstrap | grep "^Platforms:" | grep -q "$1"); then
+        echo "Platform $1 not supported by builder"
+        exit 1
+    fi
+}
+
+create_docker_builder
+PLATFORMS=(
+    linux/amd64
+    linux/arm6455
+    linux/arm/v7
+)
+for platform in "${PLATFORMS[@]}"; do
+    check_platform $platform
+done