Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

tundra/droidian/initialize-runtime.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# SPDX-License-Identifier: MPL-2.0
+# Run inside the staged root before starting its graphical session.
+set -eu
+/sbin/ldconfig
+/usr/lib/aarch64-linux-gnu/glib-2.0/glib-compile-schemas /usr/share/glib-2.0/schemas
+/usr/lib/aarch64-linux-gnu/gdk-pixbuf-2.0/gdk-pixbuf-query-loaders --update-cache
+/usr/bin/update-mime-database /usr/share/mime
+/usr/bin/python3 - <<'PY'
+import gzip
+from pathlib import Path
+for name in ('UTF-8', 'ANSI_X3.4-1968'):
+    compressed = Path('/usr/share/i18n/charmaps')/(name+'.gz')
+    if compressed.is_file():
+        compressed.with_suffix('').write_bytes(gzip.decompress(compressed.read_bytes()))
+PY
+/usr/bin/localedef --no-archive -i C -f UTF-8 C.UTF-8
+test -s /usr/lib/aarch64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache