Add action.yml metadata file

Dockerfile

@@ -1,20 +1,9 @@
 FROM debian:stable-slim
 
-LABEL "com.github.actions.name"="WordPress Plugin Readme Update"
-LABEL "com.github.actions.description"="Deploy readme and asset updates to the WordPress Plugin Repository"
-LABEL "com.github.actions.icon"="upload-cloud"
-LABEL "com.github.actions.color"="blue"
-
-LABEL maintainer="Helen Hou-Sandí <[email protected]>"
-LABEL version="1.2.1"
-LABEL repository="http://github.com/helen/action-wordpress-plugin-asset-update"
-
 RUN apt-get update \
 	&& apt-get install -y subversion rsync git \
 	&& apt-get clean -y \
-	&& rm -rf /var/lib/apt/lists/* \
-	&& git config --global user.email "[email protected]" \
-	&& git config --global user.name "10upbot on GitHub"
+	&& rm -rf /var/lib/apt/lists/*
 
 COPY entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]

action.yml

@@ -0,0 +1,9 @@
+name: 'WordPress Plugin Readme/Assets Update'
+description: 'Deploy readme and asset updates to the WordPress Plugin Repository'
+author: '10up'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+branding:
+  icon: 'upload-cloud'
+  color: 'blue'