feat: support docker image tarballs

action.yml

@@ -2,6 +2,9 @@
 name: 'Docker Run Action'
 description: 'Run a command in a new container'
 inputs:
+  tarball:
+    description: 'Image tarball'
+    required: false
   image:
     description: 'Image'
     required: true

entrypoint.sh

@@ -8,4 +8,8 @@ if [ ! -z $INPUT_DOCKER_NETWORK ];
 then INPUT_OPTIONS="$INPUT_OPTIONS --network $INPUT_DOCKER_NETWORK"
 fi
 
+if [ ! -z $INPUT_TARBALL ];
+then docker load --input $INPUT_TARBALL
+fi
+
 exec docker run -v "/var/run/docker.sock":"/var/run/docker.sock" $INPUT_OPTIONS --entrypoint=$INPUT_SHELL $INPUT_IMAGE -c "${INPUT_RUN//$'\n'/;}"