✨ Support building multi-platform images

test.bats

@@ -6,6 +6,7 @@ setup(){
 
   declare -A -p MOCK_RETURNS=(
   ['/usr/local/bin/docker']=""
+  ['sudo']=""
   ) > mockReturns
 
   export GITHUB_REF='refs/heads/master'
@@ -20,6 +21,7 @@ teardown() {
   unset INPUT_DOCKERFILE
   unset INPUT_REGISTRY
   unset INPUT_CACHE
+  unset INPUT_PLATFORMS
   unset GITHUB_SHA
   unset INPUT_PULL_REQUESTS
   unset MOCK_ERROR_CONDITION
@@ -654,6 +656,24 @@ teardown() {
 /usr/local/bin/docker logout"
 }
 
+@test "it supports building multiple platforms" {
+  export GITHUB_REF='refs/heads/main'
+  export INPUT_PLATFORMS='linux/amd64,linux/arm64'
+
+  run /entrypoint.sh
+
+  expectStdOutContains "::set-output name=tag::latest"
+
+  expectMockCalledContains "/usr/bin/sudo dd status=none of=/etc/docker/daemon.json
+/usr/bin/sudo service docker restart
+/usr/local/bin/docker login -u USERNAME --password-stdin
+/usr/local/bin/docker buildx build --platform linux/amd64,linux/arm64 -t my/repository:latest .
+/usr/local/bin/docker push my/repository:latest
+/usr/local/bin/docker inspect --format={{index .RepoDigests 0}} my/repository:latest
+/usr/local/bin/docker logout"
+  expectMockArgs '/usr/bin/sudo {"experimental": true}'
+}
+
 expectStdOutIs() {
   local expected=$(echo "${1}" | tr -d '\n')
   local got=$(echo "${output}" | tr -d '\n')