add build manifest

.build.yml

@@ -0,0 +1,16 @@
+image: debian/unstable
+packages:
+  - opam
+  - ocaml
+sources:
+  - https://git.zapashcanon.fr/zapashcanon/exit
+tasks:
+  - setup: |
+      opam init -y
+      opam update -y
+      opam install -y dune
+  - build: |
+      eval "$(opam env)"
+      cd exit
+      dune build @all
+      dune runtest

README.md

@@ -1,4 +1,4 @@
-# Exit
+# Exit [![builds.sr.ht status](https://builds.sr.ht/~zapashcanon/exit.svg)](https://builds.sr.ht/~zapashcanon/exit?)
 
 Exit is an OCaml library to get exit status as declared in `stdlib.h`. It gives access to the values of `EXIT_SUCCESS` and `EXIT_FAILURE` macros and provides some functions built around them.<Paste>