update MANIFEST.in to package only the main source

The MANIFEST.in will exclude documentation, examples and tests
and all files in the repo root. This way only the main source
in esp32_ulp/ will be packaged by sdist.

Since we're packaging to upip format, which can only be installed
by MicroPython/upip, we leave out all files that are not strictly
needed to run on the ESP32, so we save space on the device.

If anyone needs the other files on a more capable device (aka PC),
simply do a git clone.

Author: wnienhaus

MANIFEST.in

@@ -1,5 +1,11 @@
 # stuff we need to include into the sdist is handled automatically by
 # setuptools_scm - it includes all git-committed files.
-# but we want to exclude some committed files/dirs not needed in the sdist:
-exclude .gitattributes .gitignore
+# but we want only the main source code and exclude everything else
+# to not waste space on the esp32
+# (upip packages are not installable by pip on a PC, so on a PC one
+# would git clone anyway and get all the other files)
+exclude *  # exclude all files in repo root
 prune .github
+prune docs
+prune examples
+prune tests