haskell nix flake CI (#222)

* Adds preliminary flake

This nix flake should be enough to try and build an android library.

* add sha256map

* bump

* bump index-state

Co-authored-by: Moritz Angermann <moritz.angermann@gmail.com>

direct-sqlite-2.3.26.patch

@@ -0,0 +1,15 @@
+diff --git a/direct-sqlite.cabal b/direct-sqlite.cabal
+index 96f26b7..996198e 100644
+--- a/direct-sqlite.cabal
++++ b/direct-sqlite.cabal
+@@ -69,7 +69,9 @@ library
+     install-includes: sqlite3.h, sqlite3ext.h
+     include-dirs:     cbits
+
+-    if !os(windows) && !os(android)
++    extra-libraries: dl
++
++    if !os(windows) && !os(android)
+       extra-libraries: pthread
+
+     if flag(fulltextsearch)