Fix GitHub token not passed with Git context if subdir defined

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

__tests__/context.test.ts

@@ -500,6 +500,25 @@ nproc=3`],
         'https://github.com/docker/build-push-action.git#refs/heads/test-jest:docker'
       ]
     ],
+    [
+      16,
+      '0.8.2',
+      new Map<string, string>([
+        ['github-token', 'abcdefghijklmno0123456789'],
+        ['context', '{{defaultContext}}:subdir'],
+        ['load', 'false'],
+        ['no-cache', 'false'],
+        ['push', 'false'],
+        ['pull', 'false'],
+      ]),
+      [
+        'build',
+        '--iidfile', '/tmp/.docker-build-push-jest/iidfile',
+        '--secret', 'id=GIT_AUTH_TOKEN,src=/tmp/.docker-build-push-jest/.tmpname-jest',
+        '--metadata-file', '/tmp/.docker-build-push-jest/metadata-file',
+        'https://github.com/docker/build-push-action.git#refs/heads/test-jest:subdir'
+      ]
+    ]
   ])(
     '[%d] given %p with %p as inputs, returns %p',
     async (num: number, buildxVersion: string, inputs: Map<string, string>, expected: Array<string>) => {

src/context.ts

@@ -101,15 +101,16 @@ export async function getInputs(defaultContext: string): Promise<Inputs> {
 }
 
 export async function getArgs(inputs: Inputs, defaultContext: string, buildxVersion: string): Promise<Array<string>> {
+  const context = handlebars.compile(inputs.context)({defaultContext});
   // prettier-ignore
   return [
-    ...await getBuildArgs(inputs, defaultContext, buildxVersion),
+    ...await getBuildArgs(inputs, defaultContext, context, buildxVersion),
     ...await getCommonArgs(inputs, buildxVersion),
-    handlebars.compile(inputs.context)({defaultContext})
+    context
   ];
 }
 
-async function getBuildArgs(inputs: Inputs, defaultContext: string, buildxVersion: string): Promise<Array<string>> {
+async function getBuildArgs(inputs: Inputs, defaultContext: string, context: string, buildxVersion: string): Promise<Array<string>> {
   const args: Array<string> = ['build'];
   await asyncForEach(inputs.addHosts, async addHost => {
     args.push('--add-host', addHost);
@@ -166,7 +167,7 @@ async function getBuildArgs(inputs: Inputs, defaultContext: string, buildxVersio
       core.warning(err.message);
     }
   });
-  if (inputs.githubToken && !buildx.hasGitAuthToken(inputs.secrets) && inputs.context == defaultContext) {
+  if (inputs.githubToken && !buildx.hasGitAuthToken(inputs.secrets) && context.startsWith(defaultContext)) {
     args.push('--secret', await buildx.getSecretString(`GIT_AUTH_TOKEN=${inputs.githubToken}`));
   }
   if (inputs.shmSize) {