Fix various bugs (#35684)

1. Fix incorrect column in `applySubscribedCondition`, add a test
2. Fix debian version parsing, add more tests fix #35695
3. Fix log level for HTTP errors, fix #35651
4. Fix abused "panic" handler in API `Migrate`
5. Fix the redirection from PR to issue, add a test
6. Fix Actions variable & secret name validation, add more tests
    * envNameCIRegexMatch is unnecessary, removed
    * validating in "delete" function doesn't make sense, removed
7. Fix incorrect link in release email

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>

services/secrets/validation_test.go

@@ -0,0 +1,29 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package secrets
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidateName(t *testing.T) {
+	cases := []struct {
+		name  string
+		valid bool
+	}{
+		{"FOO", true},
+		{"FOO1_BAR2", true},
+		{"_FOO", true}, // really? why support this
+		{"1FOO", false},
+		{"giteA_xx", false},
+		{"githuB_xx", false},
+		{"cI", false},
+	}
+	for _, c := range cases {
+		err := ValidateName(c.name)
+		assert.Equal(t, c.valid, err == nil, "ValidateName(%q)", c.name)
+	}
+}