Rename post_build scripts to fix codeowners script (#3057)

esphome/components/esp32/post_build.py.script

@@ -0,0 +1,43 @@
+# Source https://github.com/letscontrolit/ESPEasy/pull/3845#issuecomment-1005864664
+
+import esptool
+
+# pylint: disable=E0602
+Import("env")  # noqa
+
+
+def esp32_create_combined_bin(source, target, env):
+    print("Generating combined binary for serial flashing")
+    app_offset = 0x10000
+
+    new_file_name = env.subst("$BUILD_DIR/${PROGNAME}-factory.bin")
+    sections = env.subst(env.get("FLASH_EXTRA_IMAGES"))
+    firmware_name = env.subst("$BUILD_DIR/${PROGNAME}.bin")
+    chip = env.get("BOARD_MCU")
+    flash_size = env.BoardConfig().get("upload.flash_size")
+    cmd = [
+        "--chip",
+        chip,
+        "merge_bin",
+        "-o",
+        new_file_name,
+        "--flash_size",
+        flash_size,
+    ]
+    print("    Offset | File")
+    for section in sections:
+        sect_adr, sect_file = section.split(" ", 1)
+        print(f" -  {sect_adr} | {sect_file}")
+        cmd += [sect_adr, sect_file]
+
+    print(f" - {hex(app_offset)} | {firmware_name}")
+    cmd += [hex(app_offset), firmware_name]
+
+    print()
+    print(f"Using esptool.py arguments: {' '.join(cmd)}")
+    print()
+    esptool.main(cmd)
+
+
+# pylint: disable=E0602
+env.AddPostAction("$BUILD_DIR/${PROGNAME}.bin", esp32_create_combined_bin)  # noqa