switch from git diff to git status

to handle new files

Author: Amelia Wattenbeger

index.js

@@ -15078,7 +15078,7 @@ var main = async () => {
   const outputFile = core.getInput("output_file") || "./diagram.svg";
   await import_fs2.default.writeFileSync(outputFile, componentCodeString);
   await (0, import_exec.exec)("git", ["add", outputFile]);
-  const diff = await (0, import_exec.exec)("git", ["diff", outputFile]);
+  const diff = await (0, import_exec.exec)("git", ["status", "--porcelain", outputFile]);
   core.info(`diff: ${diff}`);
   if (!diff) {
     core.info("[INFO] No changes to the repo detected, exiting");

src/index.jsx

@@ -30,7 +30,7 @@ const main = async () => {
   await fs.writeFileSync(outputFile, componentCodeString)
 
   await exec('git', ['add', outputFile])
-  const diff = await exec('git', ['diff', outputFile])
+  const diff = await exec('git', ['status', '--porcelain', outputFile])
   core.info(`diff: ${diff}`)
   if (!diff) {
     core.info('[INFO] No changes to the repo detected, exiting')