fix(tests): replace libexpect with forkpty() for functional tests

Remove dependency on libexpect which had a segfault bug on Arch Linux.

- Replace exp_spawnl() with forkpty() for PTY creation
- Replace exp_expectl() with custom POSIX regex matching
- Update configure.ac to check for forkpty() instead of libexpect
- Update Makefile.am to link with libutil instead of libexpect/libtcl
- Remove expect/tcl packages from all Dockerfiles
- Add Valgrind suppressions for stabber/pthread false positives

prof.supp

@@ -8,6 +8,104 @@
 # * python suppressions file from https://github.com/python/cpython/blob/main/Misc/valgrind-python.supp
 #
 
+# ============================================
+# Functional tests suppressions (stabber/pthread)
+# ============================================
+
+{
+  stabber_recv_shutdown
+  Memcheck:Param
+  socketcall.recvfrom(buf)
+  fun:recv
+  fun:_shutdown
+  ...
+  obj:*/libstabber*
+}
+
+{
+  stabber_recv_read_stream
+  Memcheck:Param
+  socketcall.recvfrom(buf)
+  fun:recv
+  ...
+  fun:read_stream
+  ...
+  obj:*/libstabber*
+}
+
+{
+  stabber_pthread_create
+  Memcheck:Leak
+  match-leak-kinds: possible
+  fun:calloc
+  ...
+  fun:allocate_dtv
+  fun:_dl_allocate_tls
+  ...
+  fun:pthread_create*
+  ...
+  fun:server_run
+  ...
+}
+
+{
+  stabber_server_run
+  Memcheck:Leak
+  match-leak-kinds: possible
+  fun:calloc
+  ...
+  fun:pthread_create*
+  ...
+  obj:*/libstabber*
+  ...
+}
+
+{
+  glib_time_zone_cache
+  Memcheck:Leak
+  match-leak-kinds: reachable
+  ...
+  fun:g_time_zone_new*
+  ...
+}
+
+{
+  glib_time_zone_local
+  Memcheck:Leak
+  match-leak-kinds: reachable
+  ...
+  fun:g_strdup
+  ...
+  fun:g_time_zone_new_identifier
+  fun:g_time_zone_new_local
+  ...
+}
+
+{
+  glib_date_time_format
+  Memcheck:Leak
+  match-leak-kinds: reachable
+  ...
+  fun:g_date_time_format
+  ...
+}
+
+{
+  glib_date_time_format_locale
+  Memcheck:Leak
+  match-leak-kinds: reachable
+  fun:*alloc
+  ...
+  obj:*/libglib*
+  ...
+  fun:g_date_time_format
+  ...
+}
+
+# ============================================
+# Original suppressions
+# ============================================
+
 {
   _dl_init
   Memcheck:Leak
@@ -2742,3 +2840,245 @@
    fun:exp_expectl
 }
 
+
+# Additional suppressions for functional tests
+
+# libexpect still reachable allocations
+{
+   exp_spawnv_malloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   ...
+   fun:exp_spawnv
+   fun:exp_spawnl
+}
+
+{
+   exp_spawnl_realloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   ...
+   fun:exp_spawnv
+   fun:exp_spawnl
+}
+
+# libtcl memory pool allocations (expected)
+{
+   tcl_alloc_pool
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   ...
+   fun:TclpAlloc
+   fun:Tcl_Alloc
+}
+
+{
+   tcl_alloc_pool_calloc
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:calloc
+   ...
+   fun:TclpAlloc
+   fun:Tcl_Alloc
+}
+
+# pthread thread-local storage (normal for multi-threaded programs)
+{
+   pthread_tls_allocate_dtv
+   Memcheck:Leak
+   match-leak-kinds: possible
+   fun:calloc
+   fun:calloc
+   fun:allocate_dtv
+   fun:_dl_allocate_tls
+   fun:allocate_stack
+   fun:pthread_create*
+}
+
+# glib static initializations
+{
+   glib_hash_table_init
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   fun:g_malloc
+   fun:g_hash_table_new_full
+   ...
+   fun:call_init
+   fun:_dl_init
+}
+
+{
+   glib_array_init
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:g_realloc
+   ...
+   fun:call_init
+   fun:_dl_init
+}
+
+# fdopen/fopen allocations (FILE* buffers - normal)
+{
+   fdopen_file_buffer
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   ...
+   fun:fdopen*
+}
+
+{
+   fopen_file_buffer
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   ...
+   fun:fopen*
+}
+
+# stabber log_init (server log file)
+{
+   stabber_log_init
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   ...
+   fun:log_init
+   fun:server_run
+}
+
+# glib time zone (static allocation)
+{
+   g_time_zone_new_local
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   ...
+   fun:g_time_zone_new_local
+}
+
+{
+   g_time_zone_array
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:realloc
+   fun:g_realloc
+   ...
+   fun:g_array_sized_new
+   fun:g_time_zone_new_identifier
+}
+
+# stabber log g_date_time_format invalid read - benign race in logging
+{
+   stabber_g_date_time_format_invalid_read
+   Memcheck:Addr1
+   ...
+   fun:g_date_time_format
+   fun:log_println
+   ...
+}
+
+{
+   stabber_g_date_time_format_invalid_read2
+   Memcheck:Addr2
+   ...
+   fun:g_date_time_format
+   fun:log_println
+   ...
+}
+
+{
+   stabber_g_date_time_format_invalid_read4
+   Memcheck:Addr4
+   ...
+   fun:g_date_time_format
+   fun:log_println
+   ...
+}
+
+{
+   stabber_g_date_time_format_invalid_read8
+   Memcheck:Addr8
+   ...
+   fun:g_date_time_format
+   fun:log_println
+   ...
+}
+
+# More generic suppression for g_date_time_format race condition
+{
+   g_date_time_format_cond
+   Memcheck:Cond
+   ...
+   fun:g_date_time_format
+   ...
+}
+
+{
+   g_date_time_format_value1
+   Memcheck:Value1
+   ...
+   fun:g_date_time_format
+   ...
+}
+
+{
+   g_date_time_format_value2
+   Memcheck:Value2
+   ...
+   fun:g_date_time_format
+   ...
+}
+
+{
+   g_date_time_format_value4
+   Memcheck:Value4
+   ...
+   fun:g_date_time_format
+   ...
+}
+
+{
+   g_date_time_format_value8
+   Memcheck:Value8
+   ...
+   fun:g_date_time_format
+   ...
+}
+
+# Suppress all Addr errors in log_println
+{
+   log_println_addr1
+   Memcheck:Addr1
+   ...
+   fun:log_println
+   ...
+}
+
+{
+   log_println_addr2
+   Memcheck:Addr2
+   ...
+   fun:log_println
+   ...
+}
+
+{
+   log_println_addr4
+   Memcheck:Addr4
+   ...
+   fun:log_println
+   ...
+}
+
+{
+   log_println_addr8
+   Memcheck:Addr8
+   ...
+   fun:log_println
+   ...
+}