prepare github release flow and version handling

post.py

@@ -0,0 +1,35 @@
+Import("env", "projenv")
+import os
+
+print("##post script running")
+
+def post(source,target,env):
+    #print(env.Dump())
+    esptool=env.get('UPLOADER')
+    uploaderflags=env.subst("${UPLOADERFLAGS}")
+    base=env.subst("$PIOENV")
+    appoffset=env.subst("$ESP32_APP_OFFSET")
+    firmware=env.subst("$BUILD_DIR/${PROGNAME}.bin")
+    python=env.subst("$PYTHONEXE")
+    print("base=%s,esptool=%s,appoffset=%s,uploaderflags=%s"%(base,esptool,appoffset,uploaderflags))
+    uploadparts=uploaderflags.split(" ")
+    #currently hardcoded last 8 parameters...
+    if len(uploadparts) < 6:
+        print("uploaderflags does not have enough parameter")
+        return
+    uploadfiles=uploadparts[-6:]
+    for i in range(1,len(uploadfiles),2):
+        if not os.path.isfile(uploadfiles[i]):
+            print("file %s for combine not found"%uploadfiles[i])
+            return
+    offset=uploadfiles[0]
+    outfile=os.path.join(env.subst("$BUILD_DIR"),base+"-all.bin")
+    cmd=[python,esptool,"--chip","esp32","merge_bin","--target-offset",offset,"-o",outfile]
+    cmd+=uploadfiles
+    cmd+=[appoffset,firmware]        
+    print("running %s"%" ".join(cmd))
+    env.Execute(" ".join(cmd),"#testpost")
+env.AddPostAction(
+    "$BUILD_DIR/${PROGNAME}.bin",
+    post
+)