feat: allow api key to be used for any gemHost

Author: bobvanderlinden

src/publish.js

@@ -8,7 +8,7 @@ module.exports = async function publish(
 ) {
   if (gemPublish !== false) {
     logger.log(`Publishing version ${version} to gem server`);
-    const args = ['push', gemFile, '--config-file', credentialsFile];
+    const args = ['push', gemFile, '--config-file', credentialsFile, '--key', 'api_key'];
     if (gemHost) {
       args.push('--host', gemHost);
     }

src/verifyConditions.js

@@ -100,8 +100,7 @@ You can retrieve an API key either from your \`~/.gem/credentials\` file or in y
 
   await writeFile(
     credentialsFile,
-    // TODO: Handle other hosts
-    `---\n:rubygems_api_key: ${env.GEM_HOST_API_KEY}`,
+    `---\n:api_key: ${env.GEM_HOST_API_KEY}`,
     'utf8',
   );
 };