Added dockerfile path to image label

Author: Jyotsna Singh

dist/index.js

@@ -5,6 +5,7 @@ import * as context from './context';
 import * as exec from './exec';
 import * as stateHelper from './state-helper';
 import * as core from '@actions/core';
+import * as github from '@actions/github';
 
 async function run(): Promise<void> {
   try {
@@ -23,6 +24,12 @@ async function run(): Promise<void> {
     const defContext = context.defaultContext();
     let inputs: context.Inputs = await context.getInputs(defContext);
 
+    //Add dockerfile path to label
+    let dockerfilePath = core.getInput('file') || 'Dockerfile';
+    inputs.labels.push(
+      `org.opencontainers.image.source=https://github.com/${github.context.repo.owner}/${github.context.repo.repo}/${dockerfilePath}`
+    );
+
     core.info(`🏃 Starting build...`);
     const args: string[] = await context.getArgs(inputs, defContext, buildxVersion);
     await exec.exec('docker', args).then(res => {