pkgs: add drone-rsync

A very simple wrapper script that I will migrate to, since 'drone-scp'
does not work for me anymore.

pkgs/drone-rsync/default.nix

@@ -0,0 +1,43 @@
+{ lib, makeWrapper, openssh, rsync, shellcheck, sshpass, stdenvNoCC }:
+stdenvNoCC.mkDerivation rec {
+  pname = "drone-rsync";
+  version = "0.1.0";
+
+  src = ./drone-rsync;
+
+  buildInputs = [
+    makeWrapper
+    shellcheck
+  ];
+
+  dontUnpack = true;
+
+  buildPhase = ''
+    shellcheck $src
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp $src $out/bin/${pname}
+    chmod a+x $out/bin/${pname}
+  '';
+
+  wrapperPath = lib.makeBinPath [
+    openssh
+    rsync
+    sshpass
+  ];
+
+  fixupPhase = ''
+    patchShebangs $out/bin/${pname}
+    wrapProgram $out/bin/${pname} --prefix PATH : "${wrapperPath}"
+  '';
+
+  meta = with lib; {
+    description = "Helper script to run rsync in a CI pipeline";
+    homepage = "https://gitea.belanyi.fr/ambroisie/nix-config";
+    license = with licenses; [ mit ];
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ ambroisie ];
+  };
+}