Intial dockerized version of butler

Fix exec

cat -> echo

Push package

then

Dockerfile

@@ -0,0 +1,17 @@
+FROM centos:8
+
+LABEL "com.github.actions.name"="Butler Push"
+LABEL "com.github.actions.description"="Publishes releases to Itch.io using Butler"
+LABEL "com.github.actions.icon"="upload"
+LABEL "com.github.actions.color"="white"
+
+RUN yum update -y
+
+# Install Butler
+ADD https://dl.itch.ovh/butler/linux-amd64/head/butler /usr/bin/
+RUN chmod +x /usr/bin/butler
+
+# Run butler push
+ADD entrypoint.sh /entrypoint.sh
+RUN chmod +x entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: "Butler Push"
+description: "Publish releases to Itch.io using Butler"
+author: josephbmanley
+runs:
+  using: docker
+  image: Dockerfile
+branding:
+  icon: upload
+  color: white

entrypoint.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+set -e
+
+mkdir -p ~/.config/itch
+echo $BUTLER_CREDENTIALS > ~/.config/itch/butler_creds
+
+
+versionArguement=""
+
+if [ "$VERSION" != "" ]
+then
+    versionArguement="--userversion ${VERSION}"
+elif [ "$VERSION_FILE" != "" ]
+then
+    versionArguement="--userversion-file ${VERSION_FILE}"
+fi
+
+butler push $PACKAGE $ITCH_USER/$ITCH_GAME:$CHANNEL ${versionArguement}