Fix Git context

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

README.md

@@ -54,7 +54,7 @@ build-secrets, remote cache, etc. and different builder deployment/namespacing o
 
 ### Git context
 
-The default behavior of this action is to use the [Git context invoked by your workflow](https://github.com/docker/build-push-action/blob/master/src/context.ts#L35).
+The default behavior of this action is to use the [Git context invoked by your workflow](https://github.com/docker/build-push-action/blob/master/src/context.ts#L10).
 
 ```yaml
 name: ci

action.yml

@@ -13,7 +13,6 @@ inputs:
   context:
     description: "Build's context is the set of files located in the specified PATH or URL"
     required: false
-    default: '.'
   file:
     description: "Path to the Dockerfile"
     required: false

dist/index.js

@@ -13712,7 +13712,7 @@ const buildx = __importStar(__webpack_require__(295));
 const core = __importStar(__webpack_require__(186));
 const github = __importStar(__webpack_require__(438));
 exports.tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'docker-build-push-'));
-const defaultContext = `https://github.com/${github.context.repo.owner}/${github.context.repo.repo}#${github.context.ref}`;
+const defaultContext = `https://github.com/${github.context.repo.owner}/${github.context.repo.repo}.git#${github.context.ref.replace(/^refs\//, '')}`;
 function getInputs() {
     return __awaiter(this, void 0, void 0, function* () {
         return {

src/context.ts

@@ -7,7 +7,9 @@ import * as core from '@actions/core';
 import * as github from '@actions/github';
 
 export const tmpDir: string = fs.mkdtempSync(path.join(os.tmpdir(), 'docker-build-push-'));
-const defaultContext: string = `https://github.com/${github.context.repo.owner}/${github.context.repo.repo}#${github.context.ref}`;
+const defaultContext: string = `https://github.com/${github.context.repo.owner}/${
+  github.context.repo.repo
+}.git#${github.context.ref.replace(/^refs\//, '')}`;
 
 export interface Inputs {
   context: string;