Add SPC_MUSL_DYNAMIC to static shared ext err msg

Author: N-Silbernagel

src/SPC/builder/linux/LinuxBuilder.php

@@ -162,7 +162,8 @@ public function buildPHP(int $build_target = BUILD_TARGET_NONE): void
                 throw new WrongUsageException(
                     "You're building against musl libc statically (the default on Linux), but you're trying to build shared extensions.\n" .
                     'Static musl libc does not implement `dlopen`, so your php binary is not able to load shared extensions.' . "\n" .
-                    'Either use SPC_LIBC=glibc to link against glibc on a glibc OS, or use SPC_TARGET="native-native-musl -dynamic" to link against musl libc dynamically using `zig cc`.'
+                    'Either use SPC_LIBC=glibc to link against glibc on a glibc OS, use SPC_TARGET="native-native-musl -dynamic" to link against musl libc dynamically using `zig cc`\n' .
+                    'or use SPC_MUSL_DYNAMIC=true on alpine.'
                 );
             }
             logger()->info('Building shared extensions...');