ci: add Gitea Actions workflow for make check (#21)

Adds CI workflow that runs `make check` on push/PR to main.

Co-authored-by: user <user@Mac.lan guest wan>
Co-authored-by: clawbot <clawbot@eeqj.de>
Reviewed-on: #21
Co-authored-by: clawbot <sneak+clawbot@sneak.cloud>
Co-committed-by: clawbot <sneak+clawbot@sneak.cloud>

internal/secret/helpers.go

@@ -1,33 +1,11 @@
 package secret
 
 import (
-	"crypto/rand"
 	"fmt"
-	"math/big"
 	"os"
 	"path/filepath"
 )
 
-// generateRandomString generates a random string of the specified length using the given character set
-func generateRandomString(length int, charset string) (string, error) {
-	if length <= 0 {
-		return "", fmt.Errorf("length must be positive")
-	}
-
-	result := make([]byte, length)
-	charsetLen := big.NewInt(int64(len(charset)))
-
-	for i := range length {
-		randomIndex, err := rand.Int(rand.Reader, charsetLen)
-		if err != nil {
-			return "", fmt.Errorf("failed to generate random number: %w", err)
-		}
-		result[i] = charset[randomIndex.Int64()]
-	}
-
-	return string(result), nil
-}
-
 // DetermineStateDir determines the state directory based on environment variables and OS.
 // It returns an error if no usable directory can be determined.
 func DetermineStateDir(customConfigDir string) (string, error) {