Create context.js

src/context.js

@@ -0,0 +1,19 @@
+const core = require('@actions/core')
+
+// Load variables from Actions runtime
+function getRequiredVars() {
+  return {
+    githubToken: core.getInput('token')
+  }
+}
+
+module.exports = function getContext() {
+  const requiredVars = getRequiredVars()
+  for (const variable in requiredVars) {
+    if (requiredVars[variable] === undefined) {
+      throw new Error(`${variable} is undefined. Cannot continue.`)
+    }
+  }
+  core.debug('all variables are set')
+  return requiredVars
+}