Switch to a JavaScript action

Dockerfile

@@ -1,15 +0,0 @@
-FROM alpine
-
-LABEL "repository"="http://github.com/hmarr/debug-action"
-LABEL "homepage"="http://github.com/hmarr/debug-action"
-LABEL "maintainer"="Harry Marr <[email protected]>"
-
-LABEL "com.github.actions.name"="Debug Action"
-LABEL "com.github.actions.description"="Log the action's environment variables and event payload"
-LABEL "com.github.actions.icon"="code"
-LABEL "com.github.actions.color"="yellow"
-
-RUN apk --no-cache add jq
-
-ADD entrypoint.sh /entrypoint.sh
-ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: 'Debug action'
+description: "Log the action's environment variables and event payload"
+branding:
+  icon: 'code'
+  color: 'yellow'
+runs:
+  using: 'node12'
+  main: 'index.js'

entrypoint.sh

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-set -e
-
-echo
-echo "-- Environment variables ----------------------------------------------"
-env
-echo "-----------------------------------------------------------------------"
-
-echo
-echo "-- Event JSON ---------------------------------------------------------"
-cat "$GITHUB_EVENT_PATH" | jq -M .
-echo "-----------------------------------------------------------------------"
-echo

index.js

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+const fs = require("fs");
+
+// Output environment variables. Secrets are automatically masked.
+console.log("::group::Environment variables")
+for (const [key, value] of Object.entries(process.env).sort()) {
+  console.log(`${key}=${value}`);
+}
+console.log("::endgroup::")
+
+// Output prettified event JSON.
+console.log("::group::Event JSON")
+const event = JSON.parse(fs.readFileSync(process.env["GITHUB_EVENT_PATH"]));
+console.log(JSON.stringify(event, null, 2));
+console.log("::endgroup::")