[BRANDING] parse FORGEJO__* in the container environment

(cherry picked from commit b075991747)
(cherry picked from commit da3f76228e)
(cherry picked from commit 20d196e74f)
(cherry picked from commit 0bf8b1824e)
(cherry picked from commit 655bb770a7)
(cherry picked from commit d69d5c2c46)
(cherry picked from commit 00b55e5a53)
(cherry picked from commit 456121fd8a)
(cherry picked from commit 9716a158e4)
(cherry picked from commit 7d60a6f511)
(cherry picked from commit d32a6d9437)
(cherry picked from commit ee1de38527)
(cherry picked from commit 54e7799d13)
(cherry picked from commit 4f04da7ab7)
(cherry picked from commit 0d39a0a520)
(cherry picked from commit 7d8ae8279f)

modules/setting/config_env_test.go

@@ -5,6 +5,7 @@ package setting
 
 import (
 	"os"
+	"regexp"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -33,7 +34,7 @@ func TestDecodeEnvSectionKey(t *testing.T) {
 }
 
 func TestDecodeEnvironmentKey(t *testing.T) {
-	prefix := "GITEA__"
+	prefix := regexp.MustCompile(EnvConfigKeyPrefixGitea)
 	suffix := "__FILE"
 
 	ok, section, key, file := decodeEnvironmentKey(prefix, suffix, "SEC__KEY")
@@ -60,6 +61,12 @@ func TestDecodeEnvironmentKey(t *testing.T) {
 	assert.Equal(t, "KEY", key)
 	assert.False(t, file)
 
+	ok, section, key, file = decodeEnvironmentKey(prefix, suffix, "FORGEJO__SEC__KEY")
+	assert.True(t, ok)
+	assert.Equal(t, "sec", section)
+	assert.Equal(t, "KEY", key)
+	assert.False(t, file)
+
 	// with "__FILE" suffix, it doesn't support to write "[sec].FILE" to config (no such key FILE is used in Gitea)
 	// but it could be fixed in the future by adding a new suffix like "__VALUE" (no such key VALUE is used in Gitea either)
 	ok, section, key, file = decodeEnvironmentKey(prefix, suffix, "GITEA__SEC__FILE")