Implement FSFE REUSE for golang files (#21840)

Change all license headers to comply with REUSE specification.

Fix #16132

Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

modules/validation/binding.go

@@ -1,6 +1,5 @@
 // Copyright 2017 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package validation
 

modules/validation/binding_test.go

@@ -1,6 +1,5 @@
 // Copyright 2017 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package validation
 

modules/validation/glob_pattern_test.go

@@ -1,6 +1,5 @@
 // Copyright 2019 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package validation
 

modules/validation/helpers.go

@@ -1,6 +1,5 @@
 // Copyright 2018 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package validation
 

modules/validation/helpers_test.go

@@ -1,6 +1,5 @@
 // Copyright 2018 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package validation
 

modules/validation/refname_test.go

@@ -1,6 +1,5 @@
 // Copyright 2017 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package validation
 

modules/validation/regex_pattern_test.go

@@ -1,6 +1,5 @@
 // Copyright 2021 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package validation
 

modules/validation/validurl_test.go

@@ -1,6 +1,5 @@
 // Copyright 2017 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package validation