♻️ Remove platforms options

Platform was in beta and turned out not to be usable.
This still needs some tinkering with Github actions, but this wouldn't happen here.
See https://github.com/actions/virtual-environments/issues/3090

entrypoint.sh

@@ -16,10 +16,6 @@ main() {
     sanitize "${INPUT_PASSWORD}" "password"
   fi
 
-  if uses "${INPUT_PLATFORMS}"; then
-    enableExperimentalDocker
-  fi
-
   registryToLower
   nameToLower
 
@@ -88,11 +84,6 @@ sanitize() {
   fi
 }
 
-enableExperimentalDocker() {
-  echo $'{"experimental": true}' | sudo dd status=none of=/etc/docker/daemon.json
-  sudo service docker restart
-}
-
 registryToLower(){
  INPUT_REGISTRY=$(echo "${INPUT_REGISTRY}" | tr '[A-Z]' '[a-z]')
 }
@@ -199,12 +190,7 @@ build() {
   for TAG in ${TAGS}; do
     BUILD_TAGS="${BUILD_TAGS}-t ${INPUT_NAME}:${TAG} "
   done
-  if uses "${INPUT_PLATFORMS}"; then
-    local PLATFORMS="--platform ${INPUT_PLATFORMS}"
-    docker buildx build ${PLATFORMS} ${INPUT_BUILDOPTIONS} ${BUILDPARAMS} ${BUILD_TAGS} ${CONTEXT}
-  else
-    docker build ${INPUT_BUILDOPTIONS} ${BUILDPARAMS} ${BUILD_TAGS} ${CONTEXT}
-  fi
+  docker build ${INPUT_BUILDOPTIONS} ${BUILDPARAMS} ${BUILD_TAGS} ${CONTEXT}
 }
 
 push() {