scope default git auth token to github.com

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__tests__/context.test.ts

@@ -232,7 +232,7 @@ ccc"`],
       [
         'build',
         '--output', '.',
-        '--secret', `id=GIT_AUTH_TOKEN,src=${tmpName}`,
+        '--secret', `id=GIT_AUTH_TOKEN.github.com,src=${tmpName}`,
         'https://github.com/docker/build-push-action.git#refs/heads/master'
       ],
       undefined
@@ -478,7 +478,7 @@ nproc=3`],
       [
         'build',
         '--iidfile', imageIDFilePath,
-        '--secret', `id=GIT_AUTH_TOKEN,src=${tmpName}`,
+        '--secret', `id=GIT_AUTH_TOKEN.github.com,src=${tmpName}`,
         '--metadata-file', metadataJson,
         'https://github.com/docker/build-push-action.git#refs/heads/master:subdir'
       ],

src/context.ts

@@ -183,7 +183,7 @@ async function getBuildArgs(inputs: Inputs, context: string, toolkit: Toolkit):
     }
   });
   if (inputs['github-token'] && !Build.hasGitAuthTokenSecret(inputs.secrets) && context.startsWith(Context.gitContext())) {
-    args.push('--secret', Build.resolveSecretString(`GIT_AUTH_TOKEN=${inputs['github-token']}`));
+    args.push('--secret', Build.resolveSecretString(`GIT_AUTH_TOKEN.github.com=${inputs['github-token']}`));
   }
   if (inputs['shm-size']) {
     args.push('--shm-size', inputs['shm-size']);