Specify required inputs for push container action (SOFTWARE-4730)

Author: Jack Yuan

action.yml

@@ -1,3 +1,18 @@
 name: 'Push Container Action'
 
 description: 'Push built images to Docker Hub/OSG Harbor'
+
+inputs:
+  repo:
+    description: 'Input string that gets passed along to the docker build args'
+    required: true
+  tag_list:
+    description: 'List of tags that gets passed along to the docker build args'
+    required: true
+    default: '' # set to an empty string
+  docker_username:
+    description: 'Docker username obtained from secrets'
+    required: true
+  docker_password:
+    description: 'Docker password obtained from secrets'
+    required: true