add kiss radio env to most of the variants

variants/thinknode_m1/platformio.ini

@@ -127,4 +127,9 @@ lib_deps =
   densaugeo/base64 @ ~1.4.0
   zinggjm/GxEPD2 @ 1.6.2
   bakercp/CRC32 @ ^2.0.0
-  end2endzone/NonBlockingRTTTL@^1.3.0
+  end2endzone/NonBlockingRTTTL@^1.3.0
+
+[env:ThinkNode_M1_kiss_modem]
+extends = ThinkNode_M1
+build_src_filter = ${ThinkNode_M1.build_src_filter}
+  +<../examples/kiss_modem/>